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index.js
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index.js
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import fs from 'node:fs';
import path from 'node:path';
import {pathToFileURL} from 'node:url';
import escapeStringRegexp from 'escape-string-regexp';
import {execa} from 'execa';
const pkg = JSON.parse(fs.readFileSync(new URL('package.json', import.meta.url)));
const help = `See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md`;
function isPlainObject(x) {
return x !== null && typeof x === 'object' && Reflect.getPrototypeOf(x) === Object.prototype;
}
function validate(target, properties) {
for (const key of Object.keys(properties)) {
const {required, isValid} = properties[key];
const missing = !Reflect.has(target, key);
if (missing) {
if (required) {
throw new Error(`Missing '${key}' property in TypeScript configuration for AVA. ${help}`);
}
continue;
}
if (!isValid(target[key])) {
throw new Error(`Invalid '${key}' property in TypeScript configuration for AVA. ${help}`);
}
}
for (const key of Object.keys(target)) {
if (!Reflect.has(properties, key)) {
throw new Error(`Unexpected '${key}' property in TypeScript configuration for AVA. ${help}`);
}
}
}
async function compileTypeScript(projectDir) {
return execa('tsc', ['--incremental'], {preferLocal: true, cwd: projectDir});
}
const configProperties = {
compile: {
required: true,
isValid(compile) {
return compile === false || compile === 'tsc';
},
},
rewritePaths: {
required: true,
isValid(rewritePaths) {
if (!isPlainObject(rewritePaths)) {
return false;
}
return Object.entries(rewritePaths).every(([from, to]) => from.endsWith('/') && typeof to === 'string' && to.endsWith('/'));
},
},
extensions: {
required: false,
isValid(extensions) {
return Array.isArray(extensions)
&& extensions.length > 0
&& extensions.every(ext => typeof ext === 'string' && ext !== '')
&& new Set(extensions).size === extensions.length;
},
},
};
export default function typescriptProvider({negotiateProtocol}) {
const protocol = negotiateProtocol(['ava-3.2'], {version: pkg.version});
if (protocol === null) {
return;
}
return {
main({config}) {
if (!isPlainObject(config)) {
throw new Error(`Unexpected Typescript configuration for AVA. ${help}`);
}
validate(config, configProperties);
const {
extensions = ['ts', 'cts', 'mts'],
rewritePaths: relativeRewritePaths,
compile,
} = config;
const rewritePaths = Object.entries(relativeRewritePaths).map(([from, to]) => [
path.join(protocol.projectDir, from),
path.join(protocol.projectDir, to),
]);
const testFileExtension = new RegExp(`\\.(${extensions.map(ext => escapeStringRegexp(ext)).join('|')})$`);
return {
async compile() {
if (compile === 'tsc') {
await compileTypeScript(protocol.projectDir);
}
return {
extensions: [...extensions],
rewritePaths: [...rewritePaths],
};
},
get extensions() {
return [...extensions];
},
ignoreChange(filePath) {
if (!testFileExtension.test(filePath)) {
return false;
}
return rewritePaths.some(([from]) => filePath.startsWith(from));
},
resolveTestFile(testfile) { // Used under AVA 3.2 protocol by legacy watcher implementation.
if (!testFileExtension.test(testfile)) {
return testfile;
}
const rewrite = rewritePaths.find(([from]) => testfile.startsWith(from));
if (rewrite === undefined) {
return testfile;
}
const [from, to] = rewrite;
let newExtension = '.js';
if (testfile.endsWith('.cts')) {
newExtension = '.cjs';
} else if (testfile.endsWith('.mts')) {
newExtension = '.mjs';
}
return `${to}${testfile.slice(from.length)}`.replace(testFileExtension, newExtension);
},
updateGlobs({filePatterns, ignoredByWatcherPatterns}) {
return {
filePatterns: [
...filePatterns,
'!**/*.d.ts',
...Object.values(relativeRewritePaths).map(to => `!${to}**`),
],
ignoredByWatcherPatterns: [
...ignoredByWatcherPatterns,
...Object.values(relativeRewritePaths).flatMap(to => [
`${to}**/*.js.map`,
`${to}**/*.cjs.map`,
`${to}**/*.mjs.map`,
]),
],
};
},
};
},
worker({extensionsToLoadAsModules, state: {extensions, rewritePaths}}) {
const importJs = extensionsToLoadAsModules.includes('js');
const testFileExtension = new RegExp(`\\.(${extensions.map(ext => escapeStringRegexp(ext)).join('|')})$`);
return {
canLoad(ref) {
return testFileExtension.test(ref) && rewritePaths.some(([from]) => ref.startsWith(from));
},
async load(ref, {requireFn}) {
const [from, to] = rewritePaths.find(([from]) => ref.startsWith(from));
let rewritten = `${to}${ref.slice(from.length)}`;
let useImport = true;
if (ref.endsWith('.cts')) {
rewritten = rewritten.replace(/\.cts$/, '.cjs');
useImport = false;
} else if (ref.endsWith('.mts')) {
rewritten = rewritten.replace(/\.mts$/, '.mjs');
} else {
rewritten = rewritten.replace(testFileExtension, '.js');
useImport = importJs;
}
return useImport ? import(pathToFileURL(rewritten)) : requireFn(rewritten);
},
};
},
};
}