tsc errors All In One

tsc errors All In One

tsconfig.json

# tsconfig.json

$ tsc --init

https://www.typescriptlang.org/tsconfig

https://github.com/xgqfrms/ts/issues/2

tsc --init

$ npx tsc --init

                                                                               
                This is not the tsc command you are looking for                
                                                                               

To get access to the TypeScript compiler, tsc, from the command line either:

- Use npm install typescript to first add TypeScript to your project before using npx
- Use yarn to avoid accidentally running code from un-installed packages

# 👎
$ npm i -g typescript

# ✅
$ tsc --init

$ npm i -S typescript

# ❌
$ tsc --init
# ✅
$ npx tsc --init

JSONC / JSON5

{
  "compilerOptions": {
    /* Visit https://aka.ms/tsconfig.json to read more about this file */

    /* Basic Options */
    // "incremental": true,                   /* Enable incremental compilation */
    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */
    "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
    // "lib": [],                             /* Specify library files to be included in the compilation. */
    // "allowJs": true,                       /* Allow javascript files to be compiled. */
    // "checkJs": true,                       /* Report errors in .js files. */
    // "jsx": "preserve",                     /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
    // "declaration": true,                   /* Generates corresponding '.d.ts' file. */
    // "declarationMap": true,                /* Generates a sourcemap for each corresponding '.d.ts' file. */
    // "sourceMap": true,                     /* Generates corresponding '.map' file. */
    // "outFile": "./",                       /* Concatenate and emit output to single file. */
    // "outDir": "./",                        /* Redirect output structure to the directory. */
    // "rootDir": "./",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
    // "composite": true,                     /* Enable project compilation */
    // "tsBuildInfoFile": "./",               /* Specify file to store incremental compilation information */
    // "removeComments": true,                /* Do not emit comments to output. */
    // "noEmit": true,                        /* Do not emit outputs. */
    // "importHelpers": true,                 /* Import emit helpers from 'tslib'. */
    // "downlevelIteration": true,            /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
    // "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */

    /* Strict Type-Checking Options */
    "strict": true,                           /* Enable all strict type-checking options. */
    // "noImplicitAny": true,                 /* Raise error on expressions and declarations with an implied 'any' type. */
    // "strictNullChecks": true,              /* Enable strict null checks. */
    // "strictFunctionTypes": true,           /* Enable strict checking of function types. */
    // "strictBindCallApply": true,           /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
    // "strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
    // "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
    // "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */

    /* Additional Checks */
    // "noUnusedLocals": true,                /* Report errors on unused locals. */
    // "noUnusedParameters": true,            /* Report errors on unused parameters. */
    // "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
    // "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */
    // "noUncheckedIndexedAccess": true,      /* Include 'undefined' in index signature results */

    /* Module Resolution Options */
    // "moduleResolution": "node",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
    // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
    // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
    // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
    // "typeRoots": [],                       /* List of folders to include type definitions from. */
    // "types": [],                           /* Type declaration files to be included in compilation. */
    // "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
    "esModuleInterop": true,                  /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
    // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */
    // "allowUmdGlobalAccess": true,          /* Allow accessing UMD globals from modules. */

    /* Source Map Options */
    // "sourceRoot": "",                      /* Specify the location where debugger should locate TypeScript files instead of source locations. */
    // "mapRoot": "",                         /* Specify the location where debugger should locate map files instead of generated locations. */
    // "inlineSourceMap": true,               /* Emit a single file with source maps instead of having a separate file. */
    // "inlineSources": true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */

    /* Experimental Options */
    // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
    // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */

    /* Advanced Options */
    "skipLibCheck": true,                     /* Skip type checking of declaration files. */
    "forceConsistentCasingInFileNames": true  /* Disallow inconsistently-cased references to the same file. */
  }
}

Property ??? does not exist on type ???

Try changing the lib compiler option to 'es2015' or later.

tsc ./567\ permutation-in-string.ts
567 permutation-in-string.ts:40:27 - error TS2550: Property 'fill' does not exist on type 'any[]'. Do you need to change your target library? Try changing the `lib` compiler option to 'es2015' or later.

40   const count = Array(26).fill(0);
                             ~~~~

567 permutation-in-string.ts:105:39 - error TS2550: Property 'entries' does not exist on type '{ inputs: string[]; result: boolean; desc: string; }[]'. Do you need to change your target library? Try changing the `lib` compiler option to 'es2015' or later.

105 for (const [i, testCase] of testCases.entries()) {
                                          ~~~~~~~

https://stackoverflow.com/questions/53936918/how-can-i-fix-compile-time-errors-even-using-compiler-options-as-target-es6-and

https://github.com/vega/ts-json-schema-generator/issues/103

CJS

 node ./567\ permutation-in-string.js                    
file:///Users/xgqfrms-mbp/Documents/GitHub/leetcode/js-solutions/567%20permutation-in-string.js:30
exports.__esModule = true;
^

ReferenceError: exports is not defined in ES module scope
This file is being treated as an ES module because it has a '.js' file extension and '/Users/xgqfrms-mbp/Documents/GitHub/leetcode/package.json' contains "type": "module". To treat it as a CommonJS script, rename it to use the '.cjs' file extension.
    at file:///Users/xgqfrms-mbp/Documents/GitHub/leetcode/js-solutions/567%20permutation-in-string.js:30:1
    at ModuleJob.run (node:internal/modules/esm/module_job:197:25)
    at async Promise.all (index 0)
    at async ESMLoader.import (node:internal/modules/esm/loader:337:24)
    at async loadESM (node:internal/process/esm_loader:88:5)
    at async handleMainPromise (node:internal/modules/run_main:61:12)

downlevelIteration

{
  "compilerOptions": {
    "target": "es2015",
    "module": "esnext",
    "lib": [
      "ES2015",
      "dom"
    ],
    "downlevelIteration": false,
    // ...
  }
}

$ tsc ./567\ permutation-in-string.ts
567 permutation-in-string.ts:105:29 - error TS2569: Type 'IterableIterator<[number, { inputs: string[]; result: boolean; desc: string; }]>' is not an array type or a string type. Use compiler option '--downlevelIteration' to allow iterating of iterators.

105 for (const [i, testCase] of testCases.entries()) {
                                ~~~~~~~~~~~~~~~~~~~

Found 1 error.

https://www.typescriptlang.org/tsconfig#downlevelIteration

https://stackoverflow.com/questions/53441292/why-downleveliteration-is-not-on-by-default

refs

https://www.cnblogs.com/xgqfrms/p/16109863.html

https://www.cnblogs.com/xgqfrms/p/15497462.html

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