98 lines
2.5 KiB
TypeScript
Executable file
98 lines
2.5 KiB
TypeScript
Executable file
import { createMatchPath } from "./match-path-sync";
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import { configLoader, ExplicitParams } from "./config-loader";
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import { options } from "./options";
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const noOp = (): void => void 0;
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function getCoreModules(
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builtinModules: string[] | undefined
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): { [key: string]: boolean } {
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builtinModules = builtinModules || [
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"assert",
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"buffer",
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"child_process",
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"cluster",
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"crypto",
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"dgram",
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"dns",
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"domain",
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"events",
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"fs",
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"http",
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"https",
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"net",
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"os",
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"path",
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"punycode",
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"querystring",
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"readline",
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"stream",
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"string_decoder",
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"tls",
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"tty",
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"url",
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"util",
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"v8",
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"vm",
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"zlib",
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];
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const coreModules: { [key: string]: boolean } = {};
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for (let module of builtinModules) {
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coreModules[module] = true;
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}
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return coreModules;
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}
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/**
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* Installs a custom module load function that can adhere to paths in tsconfig.
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* Returns a function to undo paths registration.
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*/
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export function register(explicitParams: ExplicitParams): () => void {
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const configLoaderResult = configLoader({
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cwd: options.cwd,
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explicitParams,
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});
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if (configLoaderResult.resultType === "failed") {
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console.warn(
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`${configLoaderResult.message}. tsconfig-paths will be skipped`
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);
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return noOp;
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}
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const matchPath = createMatchPath(
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configLoaderResult.absoluteBaseUrl,
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configLoaderResult.paths,
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configLoaderResult.mainFields,
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configLoaderResult.addMatchAll
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);
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// Patch node's module loading
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// tslint:disable-next-line:no-require-imports variable-name
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const Module = require("module");
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const originalResolveFilename = Module._resolveFilename;
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const coreModules = getCoreModules(Module.builtinModules);
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// tslint:disable-next-line:no-any
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Module._resolveFilename = function (request: string, _parent: any): string {
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const isCoreModule = coreModules.hasOwnProperty(request);
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if (!isCoreModule) {
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const found = matchPath(request);
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if (found) {
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const modifiedArguments = [found, ...[].slice.call(arguments, 1)]; // Passes all arguments. Even those that is not specified above.
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// tslint:disable-next-line:no-invalid-this
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return originalResolveFilename.apply(this, modifiedArguments);
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}
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}
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// tslint:disable-next-line:no-invalid-this
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return originalResolveFilename.apply(this, arguments);
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};
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return () => {
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// Return node's module loading to original state.
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Module._resolveFilename = originalResolveFilename;
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};
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}
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