89 lines
2.9 KiB
JavaScript
89 lines
2.9 KiB
JavaScript
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'use strict';
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/**
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* Some settings and code related to Mocha's handling of Node.js/V8 flags.
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* @private
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* @module
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*/
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const nodeFlags = process.allowedNodeEnvironmentFlags;
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const {isMochaFlag} = require('./run-option-metadata');
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const unparse = require('yargs-unparser');
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/**
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* These flags are considered "debug" flags.
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* @see {@link impliesNoTimeouts}
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* @private
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*/
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const debugFlags = new Set(['inspect', 'inspect-brk']);
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/**
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* Mocha has historical support for various `node` and V8 flags which might not
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* appear in `process.allowedNodeEnvironmentFlags`.
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* These include:
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* - `--preserve-symlinks`
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* - `--harmony-*`
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* - `--gc-global`
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* - `--trace-*`
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* - `--es-staging`
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* - `--use-strict`
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* - `--v8-*` (but *not* `--v8-options`)
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* @summary Whether or not to pass a flag along to the `node` executable.
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* @param {string} flag - Flag to test
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* @param {boolean} [bareword=true] - If `false`, we expect `flag` to have one or two leading dashes.
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* @returns {boolean} If the flag is considered a "Node" flag.
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* @private
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*/
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exports.isNodeFlag = (flag, bareword = true) => {
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if (!bareword) {
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// check if the flag begins with dashes; if not, not a node flag.
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if (!/^--?/.test(flag)) {
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return false;
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}
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// strip the leading dashes to match against subsequent checks
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flag = flag.replace(/^--?/, '');
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}
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return (
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// check actual node flags from `process.allowedNodeEnvironmentFlags`,
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// then historical support for various V8 and non-`NODE_OPTIONS` flags
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// and also any V8 flags with `--v8-` prefix
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(!isMochaFlag(flag) && nodeFlags && nodeFlags.has(flag)) ||
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debugFlags.has(flag) ||
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/(?:preserve-symlinks(?:-main)?|harmony(?:[_-]|$)|(?:trace[_-].+$)|gc(?:[_-]global)?$|es[_-]staging$|use[_-]strict$|v8[_-](?!options).+?$)/.test(
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flag
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)
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);
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};
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/**
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* Returns `true` if the flag is a "debug-like" flag. These require timeouts
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* to be suppressed, or pausing the debugger on breakpoints will cause test failures.
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* @param {string} flag - Flag to test
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* @returns {boolean}
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* @private
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*/
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exports.impliesNoTimeouts = flag => debugFlags.has(flag);
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/**
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* All non-strictly-boolean arguments to node--those with values--must specify those values using `=`, e.g., `--inspect=0.0.0.0`.
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* Unparse these arguments using `yargs-unparser` (which would result in `--inspect 0.0.0.0`), then supply `=` where we have values.
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* Apparently --require in Node.js v8 does NOT want `=`.
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* There's probably an easier or more robust way to do this; fixes welcome
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* @param {Object} opts - Arguments object
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* @returns {string[]} Unparsed arguments using `=` to specify values
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* @private
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*/
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exports.unparseNodeFlags = opts => {
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var args = unparse(opts);
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return args.length
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? args
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.join(' ')
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.split(/\b/)
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.map((arg, index, args) =>
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arg === ' ' && args[index - 1] !== 'require' ? '=' : arg
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)
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.join('')
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.split(' ')
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: [];
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};
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