Rename all proposal plugins to -proposal- from -transform- (#6570)

packages/babel-plugin-proposal-numeric-separator/src/index.js

@@ -0,0 +1,31 @@
+import syntaxNumericSeparator from "@babel/plugin-syntax-numeric-separator";
+
+export default function({ types: t }) {
+  function replaceNumberArg({ node }) {
+    if (node.callee.name !== "Number") {
+      return;
+    }
+
+    const arg = node.arguments[0];
+    if (!t.isStringLiteral(arg)) {
+      return;
+    }
+
+    arg.value = arg.value.replace(/_/g, "");
+  }
+
+  return {
+    inherits: syntaxNumericSeparator,
+
+    visitor: {
+      CallExpression: replaceNumberArg,
+      NewExpression: replaceNumberArg,
+      NumericLiteral({ node }) {
+        const { extra } = node;
+        if (extra && /_/.test(extra.raw)) {
+          extra.raw = extra.raw.replace(/_/g, "");
+        }
+      },
+    },
+  };
+}