remove undeclared plugin [skip ci] (#5407)

packages/babel-plugin-undeclared-variables-check/.npmignore

@@ -1,4 +0,0 @@
-node_modules
-*.log
-src
-test

packages/babel-plugin-undeclared-variables-check/README.md

@@ -1,56 +0,0 @@
-# babel-plugin-undeclared-variables-check
-
-> This plugin throws a compile-time error on references to undeclared variables.
-
-## Example
-
-**In**
-
-```javascript
-function foo() {}
-foo();
-bar();
-```
-
-**Out**
-
-```
-ReferenceError: stdin: Line 3: Reference to undeclared variable "bar" - did you mean "foo"?
-  1 | function foo() {}
-  2 | foo();
-> 3 | bar();
-    | ^
-  4 |
-```
-
-## Installation
-
-```sh
-npm install --save-dev babel-plugin-undeclared-variables-check
-```
-
-## Usage
-
-### Via `.babelrc` (Recommended)
-
-**.babelrc**
-
-```json
-{
-  "plugins": ["undeclared-variables-check"]
-}
-```
-
-### Via CLI
-
-```sh
-babel --plugins undeclared-variables-check script.js
-```
-
-### Via Node API
-
-```javascript
-require("babel-core").transform("code", {
-  plugins: ["undeclared-variables-check"]
-});
-```

packages/babel-plugin-undeclared-variables-check/package.json

@@ -1,17 +0,0 @@
-{
-  "name": "babel-plugin-undeclared-variables-check",
-  "version": "6.22.0",
-  "description": "Throw a compile-time error on references to undeclared variables",
-  "repository": "https://github.com/babel/babel/tree/master/packages/babel-plugin-undeclared-variables-check",
-  "license": "MIT",
-  "main": "lib/index.js",
-  "keywords": [
-    "babel-plugin"
-  ],
-  "dependencies": {
-    "leven": "^1.0.2"
-  },
-  "devDependencies": {
-    "babel-helper-plugin-test-runner": "^6.22.0"
-  }
-}

packages/babel-plugin-undeclared-variables-check/src/index.js

@@ -1,46 +0,0 @@
-import leven from "leven";
-
-export default function ({ messages }) {
-  return {
-    visitor: {
-      ReferencedIdentifier(path) {
-        const { node, scope } = path;
-
-        const binding = scope.getBinding(node.name);
-        if (binding && binding.kind === "type" && !path.parentPath.isFlow()) {
-          throw path.buildCodeFrameError(messages.get("undeclaredVariableType", node.name), ReferenceError);
-        }
-
-        if (scope.hasBinding(node.name)) return;
-
-        // get the closest declaration to offer as a suggestion
-        // the variable name may have just been mistyped
-
-        const bindings = scope.getAllBindings();
-
-        let closest;
-        let shortest = -1;
-
-        for (const name in bindings) {
-          const distance = leven(node.name, name);
-          if (distance <= 0 || distance > 3) continue;
-          if (distance <= shortest) continue;
-
-          closest = name;
-          shortest = distance;
-        }
-
-        let msg;
-        if (closest) {
-          msg = messages.get("undeclaredVariableSuggestion", node.name, closest);
-        } else {
-          msg = messages.get("undeclaredVariable", node.name);
-        }
-
-        //
-
-        throw path.buildCodeFrameError(msg, ReferenceError);
-      }
-    }
-  };
-}

packages/babel-plugin-undeclared-variables-check/test/fixtures/validation.undeclared-variable-check/declared/exec.js

@@ -1,5 +0,0 @@
-function foo() {
-  
-}
-
-foo();

packages/babel-plugin-undeclared-variables-check/test/fixtures/validation.undeclared-variable-check/options.json

@@ -1,3 +0,0 @@
-{
-  "plugins": ["undeclared-variables-check"]
-}

packages/babel-plugin-undeclared-variables-check/test/fixtures/validation.undeclared-variable-check/undeclared-shorthand-property/exec.js

@@ -1 +0,0 @@
-({foo})

packages/babel-plugin-undeclared-variables-check/test/fixtures/validation.undeclared-variable-check/undeclared-shorthand-property/options.json

@@ -1,3 +0,0 @@
-{
-  "throws": "Reference to undeclared variable"
-}

packages/babel-plugin-undeclared-variables-check/test/fixtures/validation.undeclared-variable-check/undeclared/exec.js

@@ -1 +0,0 @@
-foo();

packages/babel-plugin-undeclared-variables-check/test/fixtures/validation.undeclared-variable-check/undeclared/options.json

@@ -1,3 +0,0 @@
-{
-  "throws": "Reference to undeclared variable"
-}

packages/babel-plugin-undeclared-variables-check/test/index.js

@@ -1,3 +0,0 @@
-import runner from "babel-helper-plugin-test-runner";
-
-runner(__dirname);