typescript language service plugin tutorial

My first plugin that customize autocomplete suggestions and add a refactor suggestion. So I made kind of a tutorial example with detailed explanations. See the tutorial - with code and screen-cast here : https://cancerberosgx.github.io/typescript-plugins-of-mine/sample-ts-plugin1/src/

How to test plugins.

For example, we have sample-ts-plugin1 and sample-ts-plugin1-sample-project

• code sample-ts-plugin1-sample-project
• because it has .vscode/settings.json - "typescript.tsdk": "node_modules/typescript/lib" it vscode should use typescript version from its node_modules.
• ** verify in vscode "select typescript version" of the workspace. and reload tsserver
• because tsconfig.json has plugins installing sample-ts-plugin1 that plugin should be loaded by tsserver. (https://cancerberosgx.github.io/typescript-plugins-of-mine/sample-ts-plugin1/plugin-screencast.gif)[see screencast]
• select one identifier in the editor and you will see refactor suggestions. Also it wont autocomplete a.caller , only thisIsTheOnlyThatWillAutoComplete proeprty
• now make a change in the plugin, like changing the string "sebarefactiondesc", run "rush rebuild", restart ts server in vscode and that label should be shown as refactor suggestion label.
• for debugging and seeing messages from plugin in tsserver exec: export TSS_LOG="-logToFile true -filepwd/tsserver_log.log -level verbose"

How to use:

npm i --save-dev sample-ts-plugin1

in your tsconfig.json, add the plugin:

{
  "compilerOptions": {
    ...
    "plugins": [{
        "name": "sample-ts-plugin1",
        "remove": ["caller", "callee", "getDay"]
    }]
    ...
  }
}

Make sure you have installed typescript in your project (npm i --save-dev typescript) the editor you are using uses that typescript and not another. For example, Visual Studio Code comes with its own typescript version, so I need to "Select TypeScript Version" of the workspace:

{
  // Specifies the folder path containing the tsserver and lib*.d.ts files to use.
  "typescript.tsdk": "node_modules/typescript/lib"
}