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55 lines
1.4 KiB
JavaScript
55 lines
1.4 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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*/
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/**
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* Use invariant() to assert state which your program assumes to be true.
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*
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* Provide sprintf-style format (only %s is supported) and arguments
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* to provide information about what broke and what you were
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* expecting.
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*
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* The invariant message will be stripped in production, but the invariant
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* will remain to ensure logic does not differ in production.
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*/
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let validateFormat = () => {};
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if (__DEV__) {
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validateFormat = function(format) {
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if (format === undefined) {
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throw new Error('invariant requires an error message argument');
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}
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};
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}
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export default function invariant(condition, format, a, b, c, d, e, f) {
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validateFormat(format);
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if (!condition) {
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let error;
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if (format === undefined) {
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error = new Error(
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'Minified exception occurred; use the non-minified dev environment ' +
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'for the full error message and additional helpful warnings.',
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);
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} else {
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const args = [a, b, c, d, e, f];
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let argIndex = 0;
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error = new Error(
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format.replace(/%s/g, function() {
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return args[argIndex++];
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}),
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);
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error.name = 'Invariant Violation';
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}
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error.framesToPop = 1; // we don't care about invariant's own frame
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throw error;
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}
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}
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