@typespec/http-server-js/dist/src/write.js

TypeSpec HTTP server code generator for JavaScript

// Copyright (c) Microsoft Corporation
// Licensed under the MIT license.
import { resolvePath } from "@typespec/compiler";
import { isModule } from "./ctx.js";
import { emitModuleBody } from "./common/namespace.js";
import { createOnceQueue } from "./util/once-queue.js";
import * as prettier from "prettier";
import { EOL } from "os";
import path from "path";
import { bifilter } from "./util/iter.js";
/**
 * Writes the tree of modules to the output directory.
 *
 * @param ctx - The emitter context.
 * @param baseOutputPath - The base output directory to write the module tree to.
 * @param rootModule - The root module to begin emitting from.
 * @param format - Whether to format the output using Prettier.
 */
export async function writeModuleTree(ctx, baseOutputPath, rootModule, format) {
    const queue = createOnceQueue(rootModule);
    while (!queue.isEmpty()) {
        const module = queue.take();
        await writeModuleFile(ctx, baseOutputPath, module, queue, format);
    }
}
/**
 * Write a single module file to the output directory.
 *
 * @param ctx - The emitter context.
 * @param baseOutputPath - The base output directory to write the module tree to.
 * @param module - The module to write.
 * @param queue - The queue of modules to write.
 * @param format - Whether to format the output using Prettier.
 * @param spit - The function used to write the file to disk (default: `ctx.program.host.writeFile`).
 */
export async function writeModuleFile(ctx, baseOutputPath, module, queue, format, spit = async (name, contents) => {
    await ctx.program.host.mkdirp(path.dirname(name));
    await ctx.program.host.writeFile(name, contents);
}) {
    const moduleText = [
        "// Generated by Microsoft TypeSpec",
        "",
        ...emitModuleBody(ctx, module, queue),
    ];
    const [declaredModules, declaredText] = bifilter(module.declarations, isModule);
    if (declaredText.length === 0) {
        // Early exit to avoid writing an empty module.
        return;
    }
    const isIndex = module.cursor.path.length === 0 || declaredModules.length > 0;
    const moduleRelativePath = module.cursor.path.length > 0
        ? module.cursor.path.join("/") + (isIndex ? "/index.ts" : ".ts")
        : "index.ts";
    const modulePath = resolvePath(baseOutputPath, moduleRelativePath);
    const text = format
        ? await prettier.format(moduleText.join(EOL), {
            parser: "typescript",
        })
        : moduleText.join(EOL);
    await spit(modulePath, text);
}
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