e8a497696a
* Test lockfile using npm 7.23 * Workflow updates * Update codecov action * Cache npm dependencies * Simplify checkout * Bump minimal Node.js versions These should allow us to add features over AVA 4's lifetime using newly available Node.js APIs. * Update dev dependencies * Update to TypeScript 4.4 and latest tsd * Upgrade XO and reformat * Update dependencies * Rebuild lockfile * Run XO with Node.js 16 It fails on older Node.js versions.
46 lines
1.1 KiB
JavaScript
46 lines
1.1 KiB
JavaScript
export default function resolveExtensions(configuredExtensions, providers = []) {
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// Combine all extensions possible for testing. Remove duplicate extensions.
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const duplicates = new Set();
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const seen = new Set();
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const normalize = extensions => Array.isArray(extensions) ? extensions : Object.keys(extensions);
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const combine = extensions => {
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for (const ext of normalize(extensions)) {
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if (seen.has(ext)) {
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duplicates.add(ext);
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} else {
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seen.add(ext);
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}
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}
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};
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if (configuredExtensions !== undefined) {
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combine(configuredExtensions);
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}
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for (const {main} of providers) {
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combine(main.extensions);
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}
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if (duplicates.size > 0) {
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throw new Error(`Unexpected duplicate extensions in options: ’${[...duplicates].join('’, ’')}’.`);
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}
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// Unless the default was used by providers, as long as the extensions aren't explicitly set, set the default.
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if (configuredExtensions === undefined) {
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if (!seen.has('cjs')) {
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seen.add('cjs');
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}
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if (!seen.has('mjs')) {
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seen.add('mjs');
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}
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if (!seen.has('js')) {
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seen.add('js');
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}
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}
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return [...seen];
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}
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