next/dist/esm/server/typescript/utils.js

The React Framework

import { createFSBackedSystem, createDefaultMapFromNodeModules, createVirtualTypeScriptEnvironment } from 'next/dist/compiled/@typescript/vfs';
import path, { join } from 'path';
let ts;
let info;
let appDirRegExp;
export let virtualTsEnv;
export function log(message) {
    info.project.projectService.logger.info('[next] ' + message);
}
// This function has to be called initially.
export function init(opts) {
    const projectDir = opts.info.project.getCurrentDirectory();
    ts = opts.ts;
    info = opts.info;
    appDirRegExp = new RegExp('^' + (projectDir + '(/src)?/app').replace(/[\\/]/g, '[\\/]'));
    log('Initializing Next.js TypeScript plugin: ' + projectDir);
    const compilerOptions = info.project.getCompilerOptions();
    const fsMap = createDefaultMapFromNodeModules(compilerOptions, ts, join(projectDir, 'node_modules/typescript/lib'));
    const system = createFSBackedSystem(fsMap, projectDir, ts);
    virtualTsEnv = createVirtualTypeScriptEnvironment(system, [], ts, compilerOptions);
    if (!virtualTsEnv) {
        log('Failed to create virtual TypeScript environment. This is a bug in Next.js TypeScript plugin. Please report it by opening an issue at https://github.com/vercel/next.js/issues.');
        return false;
    }
    log('Successfully initialized Next.js TypeScript plugin!');
    return true;
}
export function getTs() {
    return ts;
}
export function getInfo() {
    return info;
}
export function getTypeChecker() {
    var _info_languageService_getProgram;
    return (_info_languageService_getProgram = info.languageService.getProgram()) == null ? void 0 : _info_languageService_getProgram.getTypeChecker();
}
export function getSource(fileName) {
    var _info_languageService_getProgram;
    return (_info_languageService_getProgram = info.languageService.getProgram()) == null ? void 0 : _info_languageService_getProgram.getSourceFile(fileName);
}
export function getSourceFromVirtualTsEnv(fileName) {
    if (virtualTsEnv.sys.fileExists(fileName)) {
        return virtualTsEnv.getSourceFile(fileName);
    }
    return getSource(fileName);
}
export function removeStringQuotes(str) {
    return str.replace(/^['"`]|['"`]$/g, '');
}
export const isPositionInsideNode = (position, node)=>{
    const start = node.getFullStart();
    return start <= position && position <= node.getFullWidth() + start;
};
export const isDefaultFunctionExport = (node)=>{
    if (ts.isFunctionDeclaration(node)) {
        let hasExportKeyword = false;
        let hasDefaultKeyword = false;
        if (node.modifiers) {
            for (const modifier of node.modifiers){
                if (modifier.kind === ts.SyntaxKind.ExportKeyword) {
                    hasExportKeyword = true;
                } else if (modifier.kind === ts.SyntaxKind.DefaultKeyword) {
                    hasDefaultKeyword = true;
                }
            }
        }
        // `export default function`
        if (hasExportKeyword && hasDefaultKeyword) {
            return true;
        }
    }
    return false;
};
export const isInsideApp = (filePath)=>{
    return appDirRegExp.test(filePath);
};
export const isAppEntryFile = (filePath)=>{
    return appDirRegExp.test(filePath) && /^(page|layout)\.(mjs|js|jsx|ts|tsx)$/.test(path.basename(filePath));
};
export const isPageFile = (filePath)=>{
    return appDirRegExp.test(filePath) && /^page\.(mjs|js|jsx|ts|tsx)$/.test(path.basename(filePath));
};
// Check if a module is a client entry.
export function getEntryInfo(fileName, throwOnInvalidDirective) {
    const source = getSource(fileName);
    if (source) {
        let isDirective = true;
        let isClientEntry = false;
        let isServerEntry = false;
        ts.forEachChild(source, (node)=>{
            if (ts.isExpressionStatement(node) && ts.isStringLiteral(node.expression)) {
                if (node.expression.text === 'use client') {
                    if (isDirective) {
                        isClientEntry = true;
                    } else {
                        if (throwOnInvalidDirective) {
                            const e = {
                                messageText: 'The `"use client"` directive must be put at the top of the file.',
                                start: node.expression.getStart(),
                                length: node.expression.getWidth()
                            };
                            throw e;
                        }
                    }
                } else if (node.expression.text === 'use server') {
                    if (isDirective) {
                        isServerEntry = true;
                    } else {
                        if (throwOnInvalidDirective) {
                            const e = {
                                messageText: 'The `"use server"` directive must be put at the top of the file.',
                                start: node.expression.getStart(),
                                length: node.expression.getWidth()
                            };
                            throw e;
                        }
                    }
                }
                if (isClientEntry && isServerEntry) {
                    const e = {
                        messageText: 'Cannot use both "use client" and "use server" directives in the same file.',
                        start: node.expression.getStart(),
                        length: node.expression.getWidth()
                    };
                    throw e;
                }
            } else {
                isDirective = false;
            }
        });
        return {
            client: isClientEntry,
            server: isServerEntry
        };
    }
    return {
        client: false,
        server: false
    };
}

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