import path from "path";
import { fileExists } from "../lib/file-exists";
import * as Log from "./output/log";
import { getTypeScriptConfiguration } from "../lib/typescript/getTypeScriptConfiguration";
import { readFileSync } from "fs";
import isError from "../lib/is-error";
import { hasNecessaryDependencies } from "../lib/has-necessary-dependencies";
let TSCONFIG_WARNED = false;
function parseJsonFile(filePath) {
    const JSON5 = require("next/dist/compiled/json5");
    const contents = readFileSync(filePath, "utf8");
    // Special case an empty file
    if (contents.trim() === "") {
        return {};
    }
    try {
        return JSON5.parse(contents);
    } catch (err) {
        if (!isError(err)) throw err;
        const { codeFrameColumns  } = require("next/dist/compiled/babel/code-frame");
        const codeFrame = codeFrameColumns(String(contents), {
            start: {
                line: err.lineNumber || 0,
                column: err.columnNumber || 0
            }
        }, {
            message: err.message,
            highlightCode: true
        });
        throw new Error(`Failed to parse "${filePath}":\n${codeFrame}`);
    }
}
export default async function loadJsConfig(dir, config) {
    let typeScriptPath;
    try {
        const deps = await hasNecessaryDependencies(dir, [
            {
                pkg: "typescript",
                file: "typescript/lib/typescript.js",
                exportsRestrict: true
            }
        ]);
        typeScriptPath = deps.resolved.get("typescript");
    } catch (_) {}
    const tsConfigPath = path.join(dir, config.typescript.tsconfigPath);
    const useTypeScript = Boolean(typeScriptPath && await fileExists(tsConfigPath));
    let implicitBaseurl;
    let jsConfig;
    // jsconfig is a subset of tsconfig
    if (useTypeScript) {
        if (config.typescript.tsconfigPath !== "tsconfig.json" && TSCONFIG_WARNED === false) {
            TSCONFIG_WARNED = true;
            Log.info(`Using tsconfig file: ${config.typescript.tsconfigPath}`);
        }
        const ts = await Promise.resolve(require(typeScriptPath));
        const tsConfig = await getTypeScriptConfiguration(ts, tsConfigPath, true);
        jsConfig = {
            compilerOptions: tsConfig.options
        };
        implicitBaseurl = path.dirname(tsConfigPath);
    }
    const jsConfigPath = path.join(dir, "jsconfig.json");
    if (!useTypeScript && await fileExists(jsConfigPath)) {
        jsConfig = parseJsonFile(jsConfigPath);
        implicitBaseurl = path.dirname(jsConfigPath);
    }
    let resolvedBaseUrl;
    if (jsConfig) {
        var _jsConfig_compilerOptions;
        if ((_jsConfig_compilerOptions = jsConfig.compilerOptions) == null ? void 0 : _jsConfig_compilerOptions.baseUrl) {
            resolvedBaseUrl = path.resolve(dir, jsConfig.compilerOptions.baseUrl);
        } else {
            resolvedBaseUrl = implicitBaseurl;
        }
    }
    return {
        useTypeScript,
        jsConfig,
        resolvedBaseUrl
    };
}

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