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超初心者TypeScriptメモ

Last updated at Posted at 2019-01-04

超初心者TypeScriptメモ

環境

$ npm list -g typescript
`-- typescript@3.2.2
tsc --version
Version 3.2.2

TypeScript

tsconfig.jsonを作る

tsc --init
  • エラーが出る場合、グローバルのtypescriptとtscをuninstallして、typescriptだけ入れ直す
npm uninstall tsc -g
npm uninstall typescript -g
npm install typescript -g

コンパイルする

tsc hoge.ts

コンパイルする(lib指定)

tsc hoge.ts --lib es6,dom

コンパイル時に↓のようなエラー(例:TS2585)が出る場合等、libの指定が必要な時用
Try changing the lib compiler option to es2015 or later. 云々

node_modules/@types/zen-observable/index.d.ts:36:14 - error TS2585: 'Symbol' only refers to a type, but is being used as a value here. Do you need to change your target library? Try changing the `lib` compiler option to es2015 or later.

コンパイルする(tsconfig.jsonを使う)

tsc -p tsconfig.json
  • この時、lib等の指定はtsconfig.json内で行う
  • ファイルの指定がしたい場合はtsconfig.json内のfilesを指定。
  • ※↓みたいな感じ。
tsconfig.json内
{
    "compilerOptions": {
        /* ~略~ */
        "target": "es6",
        "module": "commonjs",
        "lib^": ["es6","dom"],
        /* ~略~ */
    },
    "files": ["hoge.ts"]
    }
}

コンパイルするとTS2580が出る(Do you need to install type definitions for node?)

↓のエラーが出る場合、

node_modules/aws-sdk/clients/firehose.d.ts:182:22 - error TS2580: Cannot find name 'Buffer'. Do you need to install type definitions for node? Try `npm i @types/node` and then add `node` to the types field in your tsconfig.

↓のnpm installを実行して、

npm i @types/node

tsconfig.jsonにtypesを追加する。

tsconfig.json
{
    "compilerOptions": {
        /* ~略~ */
        "types": ["node"],
        /* ~略~ */
    },
}

で、tsconfig.jsonを指定してコンパイルする。

tsc -p tsconfig.json
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