@typespec/compiler/dist/src/module-resolver/node-package-resolver.js

TypeSpec compiler and standard library

import { joinPaths, resolvePath } from "../core/path-utils.js";
import { isFile, listDirHierarchy, readPackage } from "./utils.js";
/**
 * Utility to resolve node packages.
 */
export class NodePackageResolver {
    #host;
    constructor(host) {
        this.#host = host;
    }
    /**
     * Resolve a node package with the given specifier from the baseDir.
     * @param specifier Node package specifier
     * @returns NodePackage if found or undefined otherwise
     */
    async resolve(specifier, baseDir) {
        return ((await this.resolveSelf(specifier, baseDir)) ??
            (await this.resolveFromNodeModules(specifier, baseDir)));
    }
    /**
     * Resolve the NodePackage for the given specifier
     * Implementation from LOAD_PACKAGE_SELF minus the exports resolution which is called separately.
     */
    async resolveSelf(packageName, baseDir) {
        for (const dir of listDirHierarchy(baseDir)) {
            const pkgFile = resolvePath(dir, "package.json");
            if (!(await isFile(this.#host, pkgFile)))
                continue;
            const pkg = await readPackage(this.#host, pkgFile);
            if (pkg.name === packageName) {
                return pkg;
            }
            else {
                return undefined;
            }
        }
        return undefined;
    }
    /**
     * Resolve a node package from `node_modules`. Follows the implementation of LOAD_NODE_MODULES minus following the exports field.
     */
    async resolveFromNodeModules(packageName, baseDir) {
        const dirs = listDirHierarchy(baseDir);
        for (const dir of dirs) {
            const path = joinPaths(dir, "node_modules", packageName);
            const pkgFile = resolvePath(path, "package.json");
            if (await isFile(this.#host, pkgFile)) {
                const pkg = await readPackage(this.#host, pkgFile);
                if (pkg)
                    return pkg;
            }
        }
        return undefined;
    }
}
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