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index.ts
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index.ts
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import { Kind, isSchema, print } from 'graphql';
import {
SchemaPointerSingle,
DocumentPointerSingle,
debugLog,
SingleFileOptions,
Source,
UniversalLoader,
asArray,
isValidPath,
parseGraphQLSDL,
printSchemaWithDirectives,
} from '@graphql-tools/utils';
import {
GraphQLTagPluckOptions,
gqlPluckFromCodeString,
gqlPluckFromCodeStringSync,
} from '@graphql-tools/graphql-tag-pluck';
import { tryToLoadFromExport, tryToLoadFromExportSync } from './load-from-module';
import { isAbsolute, resolve } from 'path';
import { readFileSync, readFile, pathExists, pathExistsSync } from 'fs-extra';
import { cwd } from 'process';
export type CodeFileLoaderOptions = {
require?: string | string[];
pluckConfig?: GraphQLTagPluckOptions;
noPluck?: boolean;
noRequire?: boolean;
} & SingleFileOptions;
const FILE_EXTENSIONS = ['.ts', '.tsx', '.js', '.jsx', '.vue'];
export class CodeFileLoader implements UniversalLoader<CodeFileLoaderOptions> {
loaderId(): string {
return 'code-file';
}
async canLoad(
pointer: SchemaPointerSingle | DocumentPointerSingle,
options: CodeFileLoaderOptions
): Promise<boolean> {
if (isValidPath(pointer)) {
if (FILE_EXTENSIONS.find(extension => pointer.endsWith(extension))) {
const normalizedFilePath = isAbsolute(pointer) ? pointer : resolve(options.cwd || cwd(), pointer);
return pathExists(normalizedFilePath);
}
}
return false;
}
canLoadSync(pointer: SchemaPointerSingle | DocumentPointerSingle, options: CodeFileLoaderOptions): boolean {
if (isValidPath(pointer)) {
if (FILE_EXTENSIONS.find(extension => pointer.endsWith(extension))) {
const normalizedFilePath = isAbsolute(pointer) ? pointer : resolve(options.cwd || cwd(), pointer);
return pathExistsSync(normalizedFilePath);
}
}
return false;
}
async load(pointer: SchemaPointerSingle | DocumentPointerSingle, options: CodeFileLoaderOptions): Promise<Source> {
const normalizedFilePath = ensureAbsolutePath(pointer, options);
const errors: Error[] = [];
if (!options.noPluck) {
try {
const content = await readFile(normalizedFilePath, { encoding: 'utf-8' });
const sdl = await gqlPluckFromCodeString(normalizedFilePath, content, options.pluckConfig);
if (sdl) {
return parseSDL({ pointer, sdl, options });
}
} catch (e) {
debugLog(`Failed to load schema from code file "${normalizedFilePath}": ${e.message}`);
errors.push(e);
}
}
if (!options.noRequire) {
try {
if (options && options.require) {
await Promise.all(asArray(options.require).map(m => import(m)));
}
const loaded = await tryToLoadFromExport(normalizedFilePath);
const source = resolveSource(pointer, loaded, options);
if (source) {
return source;
}
} catch (e) {
errors.push(e);
}
}
if (errors.length > 0) {
throw errors[0];
}
return null;
}
loadSync(pointer: SchemaPointerSingle | DocumentPointerSingle, options: CodeFileLoaderOptions): Source {
const normalizedFilePath = ensureAbsolutePath(pointer, options);
const errors: Error[] = [];
if (!options.noPluck) {
try {
const content = readFileSync(normalizedFilePath, { encoding: 'utf-8' });
const sdl = gqlPluckFromCodeStringSync(normalizedFilePath, content, options.pluckConfig);
if (sdl) {
return parseSDL({ pointer, sdl, options });
}
} catch (e) {
debugLog(`Failed to load schema from code file "${normalizedFilePath}": ${e.message}`);
errors.push(e);
}
}
if (!options.noRequire) {
try {
if (options && options.require) {
asArray(options.require).forEach(m => require(m));
}
const loaded = tryToLoadFromExportSync(normalizedFilePath);
const source = resolveSource(pointer, loaded, options);
if (source) {
return source;
}
} catch (e) {
errors.push(e);
}
}
if (errors.length > 0) {
throw errors[0];
}
return null;
}
}
function parseSDL({ pointer, sdl, options }: { pointer: string; sdl: string; options: CodeFileLoaderOptions }) {
return parseGraphQLSDL(pointer, sdl, options);
}
function resolveSource(pointer: string, value: any, options: CodeFileLoaderOptions): Source | null {
if (isSchema(value)) {
return {
location: pointer,
rawSDL: printSchemaWithDirectives(value, options),
schema: value,
};
} else if (value?.kind === Kind.DOCUMENT) {
return {
location: pointer,
rawSDL: print(value),
document: value,
};
} else if (typeof value === 'string') {
return parseGraphQLSDL(pointer, value, options);
}
return null;
}
function ensureAbsolutePath(
pointer: SchemaPointerSingle | DocumentPointerSingle,
options: CodeFileLoaderOptions
): string {
return isAbsolute(pointer) ? pointer : resolve(options.cwd || cwd(), pointer);
}