36 lines
1.4 KiB
TypeScript
36 lines
1.4 KiB
TypeScript
const boolean = function (value: any): boolean {
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if (typeof value === 'string') {
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// According to our ESLint rules, the regular expression following below
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// should be using a named capture group. This is an official part of
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// ES2018, but Firefox fails to implement it. There has been an open issue
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// for this (see https://bugzilla.mozilla.org/show_bug.cgi?id=1362154) since
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// 2016 now, and Mozilla fails to fix this. To avoid breaking support with
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// Firefox, we explicitly disable the ESLint rule here and use a regular
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// expression without a named capture group. We should check from time to
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// time, whether support in Firefox has finally been added. Besides the
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// issue, we can check this using the following link to the kangax table:
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// https://kangax.github.io/compat-table/es2016plus/#test-RegExp_named_capture_groups
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// The original line, which is failing in Firefox:
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// return /^(?<truthy>true|t|yes|y|on|1)$/iu.test(value.trim());
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// The replacement line, which should be removed at some point in the
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// future, including the ESLint comments:
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/* eslint-disable prefer-named-capture-group */
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return /^(true|t|yes|y|on|1)$/iu.test(value.trim());
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/* eslint-enable prefer-named-capture-group */
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}
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if (typeof value === 'number') {
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return value === 1;
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}
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if (typeof value === 'boolean') {
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return value;
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}
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return false;
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};
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export { boolean };
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