init

.gitignore

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+node_modules

.npmignore

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+test

.prettierrc

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+{
+  "useTabs": false,
+  "printWidth": 70,
+  "tabWidth": 2,
+  "singleQuote": true,
+  "trailingComma": "all",
+  "jsxBracketSameLine": false,
+  "parser": "babel",
+  "noSemi": false,
+  "rcVerbose": true,
+  "arrowParens": "always"
+}

LICENSE.txt

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+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <https://unlicense.org>

README.md

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+# expression-node.macro
+
+## Intro
+
+This macro will transform a javascript block to be react native animated expression. Example:
+
+```js
+import { Animated } from 'react-native';
+const { E } = Animated;
+import re from 'expression-node.macro';
+
+useOnFrameExpression(() => {
+  const normalizedPan = re(panY - panYOffset);
+
+  const min = (a, b) => re(a < b ? a : b);
+
+  const canSwipeMore = re(
+    gestureState === State.ACTIVE && scrollY <= 0,
+  );
+
+  return re(() => {
+    // memoize last panY value in order to subtract it later from the real panY
+    if (gestureState === State.BEGAN) {
+      panYOffset = scrollY;
+    }
+
+    // check if the user has already scrolled all the way to the top
+    if (canSwipeMore) {
+      // if so - allow user to scroll more to the top
+      // in order to show the refresh controls
+      marginTop = panY >= 0 ? min(MAX_OVERSCROLL, normalizedPan) : 0;
+    }
+  });
+});
+```
+
+Will transform to:
+
+```js
+import { Animated } from 'react-native';
+const { E } = Animated;
+import re from 'expression-node.macro';
+
+useOnFrameExpression(() => {
+  const normalizedPan = E.sub(panY, panYOffset);
+
+  const min = (a, b) => E.cond(E.lessThan(a, b), a, b);
+
+  const canSwipeMore = E.and(
+    E.eq(gestureState, State.ACTIVE),
+    E.lessOrEq(scrollY, 0),
+  );
+
+  return E.block(
+    E.block([
+      E.cond(
+        E.eq(gestureState, State.BEGAN),
+        E.block([E.set(panYOffset, scrollY)]),
+      ),
+      E.cond(
+        canSwipeMore,
+        E.block([
+          E.set(
+            marginTop,
+            E.cond(
+              E.greaterOrEq(panY, 0),
+              min(MAX_OVERSCROLL, normalizedPan),
+              0,
+            ),
+          ),
+        ]),
+      ),
+    ]),
+  );
+});
+```
+
+## Installation
+
+```sh
+npm add -D terrysahaidak/expression-node.macro
+```
+
+## Usage
+
+Make sure you have Animated.E in scope:
+
+```js
+import { Animated } from 'react-native';
+const { E } = Animated;
+```
+
+Then you should be able to import `re` from the package. See example for usage cases. 
+
+## Config
+
+Define the identifier to the reanimated config name to tell the macro what identifier holds the Reanimated value.
+
+```js
+const plugins = [
+	['macros',{
+		expressionNode: {
+			identifier: 'Animated'
+		}
+	}]
+];
+```
+
+## License
+
+Based on [js-to-reanimated.macro](https://github.com/kkirby/js-to-reanimated.macro) by [kkirby](https://github.com/kkirby).
+
+MIT

babel.config.js

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+const presets = [
+  [
+    '@babel/env',
+    {
+      targets: {
+        node: 'current',
+      },
+      useBuiltIns: 'usage',
+      corejs: 3,
+      modules: false,
+    },
+  ],
+];
+
+const plugins = [
+  [
+    'macros',
+    // {
+    //   jsToReanimated: {
+    //     identifier: 'E',
+    //   },
+    // },
+  ],
+  '@babel/plugin-proposal-class-properties',
+];
+
+module.exports = { presets, plugins };