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import * as path from "path";
import * as fs from "fs";
// tslint:disable:no-require-imports
import JSON5 = require("json5");
import StripBom = require("strip-bom");
// tslint:enable:no-require-imports
/**
* Typing for the parts of tsconfig that we care about
*/
export interface Tsconfig {
extends?: string;
compilerOptions?: {
baseUrl?: string;
paths?: { [key: string]: Array<string> };
strict?: boolean;
};
}
export interface TsConfigLoaderResult {
tsConfigPath: string | undefined;
baseUrl: string | undefined;
paths: { [key: string]: Array<string> } | undefined;
}
export interface TsConfigLoaderParams {
getEnv: (key: string) => string | undefined;
cwd: string;
loadSync?(
cwd: string,
filename?: string,
baseUrl?: string
): TsConfigLoaderResult;
}
export function tsConfigLoader({
getEnv,
cwd,
loadSync = loadSyncDefault,
}: TsConfigLoaderParams): TsConfigLoaderResult {
const TS_NODE_PROJECT = getEnv("TS_NODE_PROJECT");
const TS_NODE_BASEURL = getEnv("TS_NODE_BASEURL");
// tsconfig.loadSync handles if TS_NODE_PROJECT is a file or directory
// and also overrides baseURL if TS_NODE_BASEURL is available.
const loadResult = loadSync(cwd, TS_NODE_PROJECT, TS_NODE_BASEURL);
return loadResult;
}
function loadSyncDefault(
cwd: string,
filename?: string,
baseUrl?: string
): TsConfigLoaderResult {
// Tsconfig.loadSync uses path.resolve. This is why we can use an absolute path as filename
const configPath = resolveConfigPath(cwd, filename);
if (!configPath) {
return {
tsConfigPath: undefined,
baseUrl: undefined,
paths: undefined,
};
}
const config = loadTsconfig(configPath);
return {
tsConfigPath: configPath,
baseUrl:
baseUrl ||
(config && config.compilerOptions && config.compilerOptions.baseUrl),
paths: config && config.compilerOptions && config.compilerOptions.paths,
};
}
function resolveConfigPath(cwd: string, filename?: string): string | undefined {
if (filename) {
const absolutePath = fs.lstatSync(filename).isDirectory()
? path.resolve(filename, "./tsconfig.json")
: path.resolve(cwd, filename);
return absolutePath;
}
if (fs.statSync(cwd).isFile()) {
return path.resolve(cwd);
}
const configAbsolutePath = walkForTsConfig(cwd);
return configAbsolutePath ? path.resolve(configAbsolutePath) : undefined;
}
export function walkForTsConfig(
directory: string,
existsSync: (path: string) => boolean = fs.existsSync
): string | undefined {
const configPath = path.join(directory, "./tsconfig.json");
if (existsSync(configPath)) {
return configPath;
}
const parentDirectory = path.join(directory, "../");
// If we reached the top
if (directory === parentDirectory) {
return undefined;
}
return walkForTsConfig(parentDirectory, existsSync);
}
export function loadTsconfig(
configFilePath: string,
existsSync: (path: string) => boolean = fs.existsSync,
readFileSync: (filename: string) => string = (filename: string) =>
fs.readFileSync(filename, "utf8")
): Tsconfig | undefined {
if (!existsSync(configFilePath)) {
return undefined;
}
const configString = readFileSync(configFilePath);
const cleanedJson = StripBom(configString);
const config: Tsconfig = JSON5.parse(cleanedJson);
let extendedConfig = config.extends;
if (extendedConfig) {
if (
typeof extendedConfig === "string" &&
extendedConfig.indexOf(".json") === -1
) {
extendedConfig += ".json";
}
const currentDir = path.dirname(configFilePath);
let extendedConfigPath = path.join(currentDir, extendedConfig);
if (
extendedConfig.indexOf("/") !== -1 &&
extendedConfig.indexOf(".") !== -1 &&
!existsSync(extendedConfigPath)
) {
extendedConfigPath = path.join(
currentDir,
"node_modules",
extendedConfig
);
}
const base =
loadTsconfig(extendedConfigPath, existsSync, readFileSync) || {};
// baseUrl should be interpreted as relative to the base tsconfig,
// but we need to update it so it is relative to the original tsconfig being loaded
if (base.compilerOptions && base.compilerOptions.baseUrl) {
const extendsDir = path.dirname(extendedConfig);
base.compilerOptions.baseUrl = path.join(
extendsDir,
base.compilerOptions.baseUrl
);
}
return {
...base,
...config,
compilerOptions: {
...base.compilerOptions,
...config.compilerOptions,
},
};
}
return config;
}