1 | # babel-plugin-undeclared-variables-check
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2 |
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3 | > This plugin throws a compile-time error on references to undeclared variables.
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4 |
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5 | ## Example
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6 |
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7 | **In**
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8 |
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9 | ```javascript
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10 | function foo() {}
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11 | foo();
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12 | bar();
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13 | ```
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14 |
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15 | **Out**
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16 |
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17 | ```
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18 | ReferenceError: stdin: Line 3: Reference to undeclared variable "bar" - did you mean "foo"?
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19 | 1 | function foo() {}
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20 | 2 | foo();
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21 | > 3 | bar();
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22 | | ^
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23 | 4 |
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24 | ```
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25 |
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26 | ## Installation
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27 |
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28 | ```sh
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29 | npm install --save-dev babel-plugin-undeclared-variables-check
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30 | ```
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31 |
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32 | ## Usage
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33 |
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34 | ### Via `.babelrc` (Recommended)
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35 |
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36 | **.babelrc**
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37 |
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38 | ```json
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39 | {
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40 | "plugins": ["undeclared-variables-check"]
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41 | }
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42 | ```
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43 |
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44 | ### Via CLI
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45 |
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46 | ```sh
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47 | babel --plugins undeclared-variables-check script.js
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48 | ```
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49 |
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50 | ### Via Node API
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51 |
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52 | ```javascript
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53 | require("babel-core").transform("code", {
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54 | plugins: ["undeclared-variables-check"]
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55 | });
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56 | ```
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