remove es20xx prefixes from plugins and rename folders (#6575)

packages/babel-plugin-transform-spread/src/index.js

@@ -0,0 +1,157 @@
+export default function({ types: t }, options) {
+  const { loose } = options;
+
+  function getSpreadLiteral(spread, scope) {
+    if (loose && !t.isIdentifier(spread.argument, { name: "arguments" })) {
+      return spread.argument;
+    } else {
+      return scope.toArray(spread.argument, true);
+    }
+  }
+
+  function hasSpread(nodes) {
+    for (let i = 0; i < nodes.length; i++) {
+      if (t.isSpreadElement(nodes[i])) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  function push(_props, nodes) {
+    if (!_props.length) return _props;
+    nodes.push(t.arrayExpression(_props));
+    return [];
+  }
+
+  function build(props: Array, scope) {
+    const nodes = [];
+    let _props = [];
+
+    for (const prop of props) {
+      if (t.isSpreadElement(prop)) {
+        _props = push(_props, nodes);
+        nodes.push(getSpreadLiteral(prop, scope));
+      } else {
+        _props.push(prop);
+      }
+    }
+
+    push(_props, nodes);
+
+    return nodes;
+  }
+
+  return {
+    visitor: {
+      ArrayExpression(path, state) {
+        const { node, scope } = path;
+        const elements = node.elements;
+        if (!hasSpread(elements)) return;
+
+        const nodes = build(elements, scope, state);
+        let first = nodes.shift();
+
+        if (!t.isArrayExpression(first)) {
+          nodes.unshift(first);
+          first = t.arrayExpression([]);
+        }
+
+        path.replaceWith(
+          t.callExpression(
+            t.memberExpression(first, t.identifier("concat")),
+            nodes,
+          ),
+        );
+      },
+
+      CallExpression(path, state) {
+        const { node, scope } = path;
+
+        const args = node.arguments;
+        if (!hasSpread(args)) return;
+
+        const calleePath = path.get("callee");
+        if (calleePath.isSuper()) return;
+
+        let contextLiteral = scope.buildUndefinedNode();
+
+        node.arguments = [];
+
+        let nodes;
+        if (args.length === 1 && args[0].argument.name === "arguments") {
+          nodes = [args[0].argument];
+        } else {
+          nodes = build(args, scope, state);
+        }
+
+        const first = nodes.shift();
+        if (nodes.length) {
+          node.arguments.push(
+            t.callExpression(
+              t.memberExpression(first, t.identifier("concat")),
+              nodes,
+            ),
+          );
+        } else {
+          node.arguments.push(first);
+        }
+
+        const callee = node.callee;
+
+        if (calleePath.isMemberExpression()) {
+          const temp = scope.maybeGenerateMemoised(callee.object);
+          if (temp) {
+            callee.object = t.assignmentExpression("=", temp, callee.object);
+            contextLiteral = temp;
+          } else {
+            contextLiteral = callee.object;
+          }
+          t.appendToMemberExpression(callee, t.identifier("apply"));
+        } else {
+          node.callee = t.memberExpression(node.callee, t.identifier("apply"));
+        }
+
+        if (t.isSuper(contextLiteral)) {
+          contextLiteral = t.thisExpression();
+        }
+
+        node.arguments.unshift(contextLiteral);
+      },
+
+      NewExpression(path, state) {
+        const { node, scope } = path;
+        let args = node.arguments;
+        if (!hasSpread(args)) return;
+
+        const nodes = build(args, scope, state);
+
+        const context = t.arrayExpression([t.nullLiteral()]);
+
+        args = t.callExpression(
+          t.memberExpression(context, t.identifier("concat")),
+          nodes,
+        );
+
+        path.replaceWith(
+          t.newExpression(
+            t.callExpression(
+              t.memberExpression(
+                t.memberExpression(
+                  t.memberExpression(
+                    t.identifier("Function"),
+                    t.identifier("prototype"),
+                  ),
+                  t.identifier("bind"),
+                ),
+                t.identifier("apply"),
+              ),
+              [node.callee, args],
+            ),
+            [],
+          ),
+        );
+      },
+    },
+  };
+}