@typespec/compiler
Version:
TypeSpec compiler and standard library
62 lines • 2.22 kB
JavaScript
import { access, readFile, realpath, stat } from "fs/promises";
import { join, resolve } from "path";
import { fileURLToPath, pathToFileURL } from "url";
import { resolveModule } from "./module-resolver/index.js";
/**
* Run script given by relative path from @typespec/compiler package root.
* Prefer local install resolved from cwd over current package.
*
* Prevents loading two conflicting copies of TypeSpec modules from global and
* local package locations.
*/
export async function runScript(relativePath, backupPath) {
const packageRoot = await resolvePackageRoot();
if (packageRoot) {
let script = join(packageRoot, relativePath);
if (!(await checkFileExists(script)) && backupPath) {
script = join(packageRoot, backupPath);
}
const scriptUrl = pathToFileURL(script).toString();
await import(scriptUrl);
}
else {
throw new Error("Couldn't resolve TypeSpec compiler root. This is unexpected. Please file an issue at https://github.com/microsoft/typespec.");
}
}
function checkFileExists(file) {
return access(file)
.then(() => true)
.catch(() => false);
}
async function resolvePackageRoot() {
if (process.env.TYPESPEC_SKIP_COMPILER_RESOLVE === "1") {
return await getThisPackageRoot();
}
try {
const host = {
realpath,
readFile: async (path) => await readFile(path, "utf-8"),
stat,
};
const resolved = await resolveModule(host, "@typespec/compiler", {
baseDir: process.cwd(),
});
if (resolved.type !== "module") {
throw new Error(`Error resolving "@typespec/compiler", expected to find a node module but found a file: "${resolved.path}".`);
}
return resolved.path;
}
catch (err) {
if (err.code === "MODULE_NOT_FOUND") {
// Resolution from cwd failed: use current package.
return await getThisPackageRoot();
}
else {
throw err;
}
}
}
async function getThisPackageRoot() {
return resolve(await realpath(fileURLToPath(import.meta.url)), "../../..");
}
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