Support for NumericLiteralSeparator, Stage 1 feature (#5793)

* Support for NumericLiteralSeparator, Stage 1 feature commit cd8f6e062876261a334d968f875e477a48927b6d Author: Sven SAULEAU <xtuc@users.noreply.github.com> Date: Wed May 31 16:14:15 2017 +0200 docs: update README [skip ci] commit cf013e3382bf73cdf9224026c1ec0b1a368cfef2 Author: Rick Waldron <waldron.rick@gmail.com> Date: Tue May 30 14:51:20 2017 -0400 Support for NumericLiteralSeparator, Stage 1 feature Signed-off-by: Rick Waldron <waldron.rick@gmail.com> Signed-off-by: Rick Waldron <waldron.rick@gmail.com> * add note about presets [skip ci]
2017-05-31 15:18:48 -04:00
parent defde165ed
commit 5393a49349
24 changed files with 269 additions and 5 deletions
--- a/packages/babel-plugin-transform-numeric-separator/src/index.js
+++ b/packages/babel-plugin-transform-numeric-separator/src/index.js
@@ -0,0 +1,31 @@
+import syntaxNumericSeparator from "babel-plugin-syntax-numeric-separator";
+
+export default function () {
+
+  function replacer(value) {
+    return value.replace(/_/g, "");
+  }
+
+  function replaceNumberArg({ node }) {
+    if (node.callee.name === "Number") {
+      node.arguments[0].value = replacer(node.arguments[0].value);
+    }
+  }
+
+  const CallExpression = replaceNumberArg;
+  const NewExpression = replaceNumberArg;
+
+  return {
+    inherits: syntaxNumericSeparator,
+
+    visitor: {
+      CallExpression,
+      NewExpression,
+      NumericLiteral({ node }) {
+        if (node.extra && /_/.test(node.extra.raw)) {
+          node.value = replacer(node.extra.raw);
+        }
+      },
+    },
+  };
+}