Marc Mintel
5397309103
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77 lines
1.3 KiB
Plaintext
77 lines
1.3 KiB
Plaintext
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const SAFE_IDENTIFIER = /^[_a-z$][_a-z$0-9]*$/i;
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const RESERVED_IDENTIFIER = new Set([
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"break",
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"case",
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"catch",
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"class",
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"const",
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"continue",
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"debugger",
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"default",
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"delete",
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"do",
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"else",
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"export",
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"extends",
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"finally",
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"for",
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"function",
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"if",
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"import",
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"in",
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"instanceof",
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"new",
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"return",
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"super",
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"switch",
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"this",
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"throw",
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"try",
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"typeof",
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"var",
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"void",
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"while",
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"with",
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"enum",
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// strict mode
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"implements",
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"interface",
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"let",
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"package",
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"private",
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"protected",
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"public",
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"static",
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"yield",
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// module code
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"await",
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// skip future reserved keywords defined under ES1 till ES3
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// additional
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"null",
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"true",
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"false"
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]);
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/**
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* @summary Returns a valid JS property name for the given property.
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* Certain strings like "default", "null", and names with whitespace are not
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* valid JS property names, so they are returned as strings.
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* @param {string} prop property name to analyze
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* @returns {string} valid JS property name
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*/
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const propertyName = (prop) => {
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if (SAFE_IDENTIFIER.test(prop) && !RESERVED_IDENTIFIER.has(prop)) {
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return prop;
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}
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return JSON.stringify(prop);
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};
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module.exports = { RESERVED_IDENTIFIER, SAFE_IDENTIFIER, propertyName };
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