mirror of
https://github.com/zebrajr/react.git
synced 2025-12-07 00:20:28 +01:00
741 lines
24 KiB
JavaScript
741 lines
24 KiB
JavaScript
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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'use strict';
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export default function(babel) {
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if (typeof babel.getEnv === 'function') {
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// Only available in Babel 7.
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const env = babel.getEnv();
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if (env !== 'development') {
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throw new Error(
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'React Refresh Babel transform should only be enabled in development environment. ' +
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'Instead, the environment is: "' +
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env +
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'".',
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);
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}
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}
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const {types: t} = babel;
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const registrationsByProgramPath = new Map();
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function createRegistration(programPath, persistentID) {
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const handle = programPath.scope.generateUidIdentifier('c');
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if (!registrationsByProgramPath.has(programPath)) {
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registrationsByProgramPath.set(programPath, []);
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}
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const registrations = registrationsByProgramPath.get(programPath);
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registrations.push({
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handle,
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persistentID,
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});
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return handle;
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}
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function isComponentishName(name) {
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return typeof name === 'string' && name[0] >= 'A' && name[0] <= 'Z';
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}
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function findInnerComponents(inferredName, path, callback) {
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const node = path.node;
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switch (node.type) {
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case 'Identifier': {
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if (!isComponentishName(node.name)) {
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return false;
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}
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// export default hoc(Foo)
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// const X = hoc(Foo)
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callback(inferredName, node, null);
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return true;
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}
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case 'FunctionDeclaration': {
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// function Foo() {}
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// export function Foo() {}
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// export default function Foo() {}
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callback(inferredName, node.id, null);
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return true;
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}
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case 'ArrowFunctionExpression': {
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if (node.body.type === 'ArrowFunctionExpression') {
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return false;
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}
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// let Foo = () => {}
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// export default hoc1(hoc2(() => {}))
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callback(inferredName, node, path);
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return true;
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}
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case 'FunctionExpression': {
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// let Foo = function() {}
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// const Foo = hoc1(forwardRef(function renderFoo() {}))
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// export default memo(function() {})
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callback(inferredName, node, path);
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return true;
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}
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case 'CallExpression': {
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const argsPath = path.get('arguments');
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if (argsPath === undefined || argsPath.length === 0) {
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return false;
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}
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const calleePath = path.get('callee');
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switch (calleePath.node.type) {
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case 'MemberExpression':
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case 'Identifier': {
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const calleeSource = calleePath.getSource();
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const firstArgPath = argsPath[0];
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const innerName = inferredName + '$' + calleeSource;
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const foundInside = findInnerComponents(
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innerName,
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firstArgPath,
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callback,
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);
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if (!foundInside) {
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return false;
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}
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// const Foo = hoc1(hoc2(() => {}))
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// export default memo(React.forwardRef(function() {}))
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callback(inferredName, node, path);
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return true;
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}
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default: {
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return false;
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}
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}
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}
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case 'VariableDeclarator': {
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const init = node.init;
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if (init === null) {
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return false;
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}
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const name = node.id.name;
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if (!isComponentishName(name)) {
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return false;
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}
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switch (init.type) {
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case 'ArrowFunctionExpression':
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case 'FunctionExpression':
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// Likely component definitions.
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break;
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case 'CallExpression': {
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// Maybe a HOC.
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// Try to determine if this is some form of import.
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const callee = init.callee;
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const calleeType = callee.type;
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if (calleeType === 'Import') {
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return false;
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} else if (calleeType === 'Identifier') {
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if (callee.name.indexOf('require') === 0) {
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return false;
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} else if (callee.name.indexOf('import') === 0) {
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return false;
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}
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// Neither require nor import. Might be a HOC.
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// Pass through.
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} else if (calleeType === 'MemberExpression') {
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// Could be something like React.forwardRef(...)
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// Pass through.
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} else {
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// More complicated call.
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return false;
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}
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break;
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}
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case 'TaggedTemplateExpression':
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// Maybe something like styled.div`...`
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break;
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default:
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return false;
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}
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const initPath = path.get('init');
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const foundInside = findInnerComponents(
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inferredName,
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initPath,
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callback,
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);
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if (foundInside) {
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return true;
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}
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// See if this identifier is used in JSX. Then it's a component.
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const binding = path.scope.getBinding(name);
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if (binding === undefined) {
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return;
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}
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let isLikelyUsedAsType = false;
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const referencePaths = binding.referencePaths;
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for (let i = 0; i < referencePaths.length; i++) {
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const ref = referencePaths[i];
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if (
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ref.node.type !== 'JSXIdentifier' &&
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ref.node.type !== 'Identifier'
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) {
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continue;
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}
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const refParent = ref.parent;
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if (refParent.type === 'JSXOpeningElement') {
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isLikelyUsedAsType = true;
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} else if (refParent.type === 'CallExpression') {
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const callee = refParent.callee;
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let fnName;
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switch (callee.type) {
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case 'Identifier':
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fnName = callee.name;
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break;
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case 'MemberExpression':
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fnName = callee.property.name;
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break;
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}
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switch (fnName) {
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case 'createElement':
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case 'jsx':
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case 'jsxDEV':
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case 'jsxs':
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isLikelyUsedAsType = true;
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break;
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}
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}
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if (isLikelyUsedAsType) {
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// const X = ... + later <X />
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callback(inferredName, init, initPath);
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return true;
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}
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}
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}
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}
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return false;
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}
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function isBuiltinHook(hookName) {
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switch (hookName) {
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case 'useState':
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case 'React.useState':
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case 'useReducer':
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case 'React.useReducer':
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case 'useEffect':
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case 'React.useEffect':
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case 'useLayoutEffect':
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case 'React.useLayoutEffect':
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case 'useMemo':
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case 'React.useMemo':
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case 'useCallback':
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case 'React.useCallback':
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case 'useRef':
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case 'React.useRef':
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case 'useContext':
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case 'React.useContext':
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case 'useImperativeMethods':
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case 'React.useImperativeMethods':
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case 'useDebugValue':
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case 'React.useDebugValue':
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return true;
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default:
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return false;
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}
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}
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function getHookCallsSignature(functionNode) {
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const fnHookCalls = hookCalls.get(functionNode);
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if (fnHookCalls === undefined) {
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return null;
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}
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return {
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key: fnHookCalls.map(call => call.name + '{' + call.key + '}').join('\n'),
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customHooks: fnHookCalls
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.filter(call => !isBuiltinHook(call.name))
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.map(call => t.cloneDeep(call.callee)),
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};
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}
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let hasForceResetCommentByFile = new WeakMap();
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// We let user do /* @refresh reset */ to reset state in the whole file.
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function hasForceResetComment(path) {
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const file = path.hub.file;
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let hasForceReset = hasForceResetCommentByFile.get(file);
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if (hasForceReset !== undefined) {
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return hasForceReset;
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}
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hasForceReset = false;
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const comments = file.ast.comments;
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for (let i = 0; i < comments.length; i++) {
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const cmt = comments[i];
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if (cmt.value.indexOf('@refresh reset') !== -1) {
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hasForceReset = true;
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break;
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}
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}
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hasForceResetCommentByFile.set(file, hasForceReset);
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return hasForceReset;
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}
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function createArgumentsForSignature(node, signature, scope) {
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const {key, customHooks} = signature;
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let forceReset = hasForceResetComment(scope.path);
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let customHooksInScope = [];
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customHooks.forEach(callee => {
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// Check if a correponding binding exists where we emit the signature.
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let bindingName;
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switch (callee.type) {
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case 'MemberExpression':
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if (callee.object.type === 'Identifier') {
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bindingName = callee.object.name;
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}
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break;
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case 'Identifier':
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bindingName = callee.name;
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break;
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}
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if (scope.hasBinding(bindingName)) {
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customHooksInScope.push(callee);
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} else {
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// We don't have anything to put in the array because Hook is out of scope.
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// Since it could potentially have been edited, remount the component.
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forceReset = true;
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}
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});
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const args = [node, t.stringLiteral(key)];
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if (forceReset || customHooksInScope.length > 0) {
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args.push(t.booleanLiteral(forceReset));
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}
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if (customHooksInScope.length > 0) {
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args.push(
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// TODO: We could use an arrow here to be more compact.
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// However, don't do it until AMA can run them natively.
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t.functionExpression(
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null,
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[],
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t.blockStatement([
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t.returnStatement(t.arrayExpression(customHooksInScope)),
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]),
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),
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);
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}
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return args;
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}
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let seenForRegistration = new WeakSet();
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let seenForSignature = new WeakSet();
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let seenForOutro = new WeakSet();
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let hookCalls = new WeakMap();
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const HookCallsVisitor = {
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CallExpression(path) {
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const node = path.node;
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const callee = node.callee;
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// Note: this visitor MUST NOT mutate the tree in any way.
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// It runs early in a separate traversal and should be very fast.
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let name = null;
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switch (callee.type) {
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case 'Identifier':
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name = callee.name;
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break;
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case 'MemberExpression':
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name = callee.property.name;
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break;
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}
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if (name === null || !/^use[A-Z]/.test(name)) {
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return;
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}
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const fnScope = path.scope.getFunctionParent();
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if (fnScope === null) {
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return;
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}
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// This is a Hook call. Record it.
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const fnNode = fnScope.block;
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if (!hookCalls.has(fnNode)) {
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hookCalls.set(fnNode, []);
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}
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let hookCallsForFn = hookCalls.get(fnNode);
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let key = '';
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if (path.parent.type === 'VariableDeclarator') {
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// TODO: if there is no LHS, consider some other heuristic.
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key = path.parentPath.get('id').getSource();
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}
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// Some built-in Hooks reset on edits to arguments.
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const args = path.get('arguments');
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if (name === 'useState' && args.length > 0) {
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// useState second argument is initial state.
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key += '(' + args[0].getSource() + ')';
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} else if (name === 'useReducer' && args.length > 1) {
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// useReducer second argument is initial state.
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key += '(' + args[1].getSource() + ')';
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}
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hookCallsForFn.push({
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callee: path.node.callee,
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name,
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key,
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});
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},
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};
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return {
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visitor: {
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ExportDefaultDeclaration(path) {
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const node = path.node;
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const decl = node.declaration;
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const declPath = path.get('declaration');
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if (decl.type !== 'CallExpression') {
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// For now, we only support possible HOC calls here.
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// Named function declarations are handled in FunctionDeclaration.
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// Anonymous direct exports like export default function() {}
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// are currently ignored.
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return;
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}
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// Make sure we're not mutating the same tree twice.
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// This can happen if another Babel plugin replaces parents.
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if (seenForRegistration.has(node)) {
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return;
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}
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seenForRegistration.add(node);
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// Don't mutate the tree above this point.
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// This code path handles nested cases like:
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// export default memo(() => {})
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// In those cases it is more plausible people will omit names
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// so they're worth handling despite possible false positives.
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// More importantly, it handles the named case:
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// export default memo(function Named() {})
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const inferredName = '%default%';
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const programPath = path.parentPath;
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findInnerComponents(
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inferredName,
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declPath,
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(persistentID, targetExpr, targetPath) => {
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if (targetPath === null) {
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// For case like:
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// export default hoc(Foo)
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// we don't want to wrap Foo inside the call.
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// Instead we assume it's registered at definition.
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return;
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}
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const handle = createRegistration(programPath, persistentID);
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targetPath.replaceWith(
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t.assignmentExpression('=', handle, targetExpr),
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);
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},
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);
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},
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FunctionDeclaration: {
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enter(path) {
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const node = path.node;
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let programPath;
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let insertAfterPath;
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switch (path.parent.type) {
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case 'Program':
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insertAfterPath = path;
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programPath = path.parentPath;
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break;
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case 'ExportNamedDeclaration':
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insertAfterPath = path.parentPath;
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programPath = insertAfterPath.parentPath;
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break;
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case 'ExportDefaultDeclaration':
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insertAfterPath = path.parentPath;
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programPath = insertAfterPath.parentPath;
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break;
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default:
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return;
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}
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const id = node.id;
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if (id === null) {
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// We don't currently handle anonymous default exports.
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return;
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}
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const inferredName = id.name;
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if (!isComponentishName(inferredName)) {
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return;
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}
|
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|
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// Make sure we're not mutating the same tree twice.
|
|
// This can happen if another Babel plugin replaces parents.
|
|
if (seenForRegistration.has(node)) {
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return;
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}
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seenForRegistration.add(node);
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// Don't mutate the tree above this point.
|
|
|
|
// export function Named() {}
|
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// function Named() {}
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findInnerComponents(
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inferredName,
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path,
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(persistentID, targetExpr) => {
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const handle = createRegistration(programPath, persistentID);
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insertAfterPath.insertAfter(
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t.expressionStatement(
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t.assignmentExpression('=', handle, targetExpr),
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),
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);
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|
},
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);
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},
|
|
exit(path) {
|
|
const node = path.node;
|
|
const id = node.id;
|
|
if (id === null) {
|
|
return;
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|
}
|
|
const signature = getHookCallsSignature(node);
|
|
if (signature === null) {
|
|
return;
|
|
}
|
|
|
|
// Make sure we're not mutating the same tree twice.
|
|
// This can happen if another Babel plugin replaces parents.
|
|
if (seenForSignature.has(node)) {
|
|
return;
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|
}
|
|
seenForSignature.add(node);
|
|
// Don't mutate the tree above this point.
|
|
|
|
const sigCallID = path.scope.generateUidIdentifier('_s');
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path.scope.parent.push({
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id: sigCallID,
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init: t.callExpression(t.identifier('$RefreshSig$'), []),
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|
});
|
|
|
|
// The signature call is split in two parts. One part is called inside the function.
|
|
// This is used to signal when first render happens.
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|
path
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.get('body')
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|
.unshiftContainer(
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'body',
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|
t.expressionStatement(t.callExpression(sigCallID, [])),
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);
|
|
|
|
// The second call is around the function itself.
|
|
// This is used to associate a type with a signature.
|
|
|
|
// Unlike with $RefreshReg$, this needs to work for nested
|
|
// declarations too. So we need to search for a path where
|
|
// we can insert a statement rather than hardcoding it.
|
|
let insertAfterPath = null;
|
|
path.find(p => {
|
|
if (p.parentPath.isBlock()) {
|
|
insertAfterPath = p;
|
|
return true;
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}
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});
|
|
if (insertAfterPath === null) {
|
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return;
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|
}
|
|
|
|
insertAfterPath.insertAfter(
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t.expressionStatement(
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t.callExpression(
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sigCallID,
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createArgumentsForSignature(
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|
id,
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signature,
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|
insertAfterPath.scope,
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),
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),
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),
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);
|
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},
|
|
},
|
|
'ArrowFunctionExpression|FunctionExpression': {
|
|
exit(path) {
|
|
const node = path.node;
|
|
const signature = getHookCallsSignature(node);
|
|
if (signature === null) {
|
|
return;
|
|
}
|
|
|
|
// Make sure we're not mutating the same tree twice.
|
|
// This can happen if another Babel plugin replaces parents.
|
|
if (seenForSignature.has(node)) {
|
|
return;
|
|
}
|
|
seenForSignature.add(node);
|
|
// Don't mutate the tree above this point.
|
|
|
|
const sigCallID = path.scope.generateUidIdentifier('_s');
|
|
path.scope.parent.push({
|
|
id: sigCallID,
|
|
init: t.callExpression(t.identifier('$RefreshSig$'), []),
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|
});
|
|
|
|
// The signature call is split in two parts. One part is called inside the function.
|
|
// This is used to signal when first render happens.
|
|
path
|
|
.get('body')
|
|
.unshiftContainer(
|
|
'body',
|
|
t.expressionStatement(t.callExpression(sigCallID, [])),
|
|
);
|
|
|
|
// The second call is around the function itself.
|
|
// This is used to associate a type with a signature.
|
|
|
|
if (path.parent.type === 'VariableDeclarator') {
|
|
let insertAfterPath = null;
|
|
path.find(p => {
|
|
if (p.parentPath.isBlock()) {
|
|
insertAfterPath = p;
|
|
return true;
|
|
}
|
|
});
|
|
if (insertAfterPath === null) {
|
|
return;
|
|
}
|
|
// Special case when a function would get an inferred name:
|
|
// let Foo = () => {}
|
|
// let Foo = function() {}
|
|
// We'll add signature it on next line so that
|
|
// we don't mess up the inferred 'Foo' function name.
|
|
insertAfterPath.insertAfter(
|
|
t.expressionStatement(
|
|
t.callExpression(
|
|
sigCallID,
|
|
createArgumentsForSignature(
|
|
path.parent.id,
|
|
signature,
|
|
insertAfterPath.scope,
|
|
),
|
|
),
|
|
),
|
|
);
|
|
// Result: let Foo = () => {}; __signature(Foo, ...);
|
|
} else {
|
|
// let Foo = hoc(() => {})
|
|
path.replaceWith(
|
|
t.callExpression(
|
|
sigCallID,
|
|
createArgumentsForSignature(node, signature, path.scope),
|
|
),
|
|
);
|
|
// Result: let Foo = hoc(__signature(() => {}, ...))
|
|
}
|
|
},
|
|
},
|
|
VariableDeclaration(path) {
|
|
const node = path.node;
|
|
let programPath;
|
|
let insertAfterPath;
|
|
switch (path.parent.type) {
|
|
case 'Program':
|
|
insertAfterPath = path;
|
|
programPath = path.parentPath;
|
|
break;
|
|
case 'ExportNamedDeclaration':
|
|
insertAfterPath = path.parentPath;
|
|
programPath = insertAfterPath.parentPath;
|
|
break;
|
|
case 'ExportDefaultDeclaration':
|
|
insertAfterPath = path.parentPath;
|
|
programPath = insertAfterPath.parentPath;
|
|
break;
|
|
default:
|
|
return;
|
|
}
|
|
|
|
// Make sure we're not mutating the same tree twice.
|
|
// This can happen if another Babel plugin replaces parents.
|
|
if (seenForRegistration.has(node)) {
|
|
return;
|
|
}
|
|
seenForRegistration.add(node);
|
|
// Don't mutate the tree above this point.
|
|
|
|
const declPaths = path.get('declarations');
|
|
if (declPaths.length !== 1) {
|
|
return;
|
|
}
|
|
const declPath = declPaths[0];
|
|
const inferredName = declPath.node.id.name;
|
|
findInnerComponents(
|
|
inferredName,
|
|
declPath,
|
|
(persistentID, targetExpr, targetPath) => {
|
|
if (targetPath === null) {
|
|
// For case like:
|
|
// export const Something = hoc(Foo)
|
|
// we don't want to wrap Foo inside the call.
|
|
// Instead we assume it's registered at definition.
|
|
return;
|
|
}
|
|
const handle = createRegistration(programPath, persistentID);
|
|
if (
|
|
(targetExpr.type === 'ArrowFunctionExpression' ||
|
|
targetExpr.type === 'FunctionExpression') &&
|
|
targetPath.parent.type === 'VariableDeclarator'
|
|
) {
|
|
// Special case when a function would get an inferred name:
|
|
// let Foo = () => {}
|
|
// let Foo = function() {}
|
|
// We'll register it on next line so that
|
|
// we don't mess up the inferred 'Foo' function name.
|
|
insertAfterPath.insertAfter(
|
|
t.expressionStatement(
|
|
t.assignmentExpression('=', handle, declPath.node.id),
|
|
),
|
|
);
|
|
// Result: let Foo = () => {}; _c1 = Foo;
|
|
} else {
|
|
// let Foo = hoc(() => {})
|
|
targetPath.replaceWith(
|
|
t.assignmentExpression('=', handle, targetExpr),
|
|
);
|
|
// Result: let Foo = _c1 = hoc(() => {})
|
|
}
|
|
},
|
|
);
|
|
},
|
|
Program: {
|
|
enter(path) {
|
|
// This is a separate early visitor because we need to collect Hook calls
|
|
// and "const [foo, setFoo] = ..." signatures before the destructuring
|
|
// transform mangles them. This extra traversal is not ideal for perf,
|
|
// but it's the best we can do until we stop transpiling destructuring.
|
|
path.traverse(HookCallsVisitor);
|
|
},
|
|
exit(path) {
|
|
const registrations = registrationsByProgramPath.get(path);
|
|
if (registrations === undefined) {
|
|
return;
|
|
}
|
|
|
|
// Make sure we're not mutating the same tree twice.
|
|
// This can happen if another Babel plugin replaces parents.
|
|
const node = path.node;
|
|
if (seenForOutro.has(node)) {
|
|
return;
|
|
}
|
|
seenForOutro.add(node);
|
|
// Don't mutate the tree above this point.
|
|
|
|
registrationsByProgramPath.delete(path);
|
|
const declarators = [];
|
|
path.pushContainer('body', t.variableDeclaration('var', declarators));
|
|
registrations.forEach(({handle, persistentID}) => {
|
|
path.pushContainer(
|
|
'body',
|
|
t.expressionStatement(
|
|
t.callExpression(t.identifier('$RefreshReg$'), [
|
|
handle,
|
|
t.stringLiteral(persistentID),
|
|
]),
|
|
),
|
|
);
|
|
declarators.push(t.variableDeclarator(handle));
|
|
});
|
|
},
|
|
},
|
|
},
|
|
};
|
|
}
|