vscode cannot perform smart prompts on js

1. Install typings.

npm install typings --global

2. Initialize typings under the project.

typings init

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3. Add jsconfig.json under the project. The content is as follows:

{
 // See https://go.microsoft.com/fwlink/?LinkId=759670
 // for the documentation about the jsconfig.json format
 "compilerOptions": {
 "target": "es5",
 "module": "commonjs",
 "allowSyntheticDefaultImports": true
 },
 "exclude": [
 "node_modules",
 "bower_components",
 "jspm_packages",
 "tmp",
 "temp"
 ]
}

4. Install the desired prompts.

typings install dt~node --global --save
typings install express --ambient --save

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