Typescript migration

package.json

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+{
+  "name": "ebox",
+  "version": "1.0.0",
+  "description": "Create rectangles within After Effects expressions ",
+  "main": "src/index.ts",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "tsc": "tsc",
+    "build": "rollup -c",
+    "watch": "rollup -cw",
+    "release": "hub release create -a 'dist/eKeys.jsx"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/motiondeveloper/ebox.git"
+  },
+  "author": "Tim Haywood",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/motiondeveloper/ebox/issues"
+  },
+  "homepage": "https://github.com/motiondeveloper/ebox#readme",
+  "devDependencies": {
+    "@rollup/plugin-typescript": "^5.0.2",
+    "prettier": "^1.16.4",
+    "rollup": "^2.26.3",
+    "rollup-plugin-ae-jsx": "^1.1.3",
+    "tslib": "^2.0.1",
+    "typescript": "^3.9.7"
+  },
+  "dependencies": {
+    "expression-globals-typescript": "^1.1.1"
+  }
+}

prettier.config.js

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+module.exports = {
+  trailingComma: "es5",
+  singleQuote: true,
+};

rollup.config.js

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+import typescript from '@rollup/plugin-typescript';
+import afterEffectJsx from 'rollup-plugin-ae-jsx';
+
+export default {
+  input: 'src/index.ts',
+  output: {
+    file: 'dist/eBox.jsx',
+    format: 'cjs',
+  },
+  plugins: [
+    typescript({
+      module: 'esnext',
+      target: 'esnext',
+      noImplicitAny: true,
+      moduleResolution: 'node',
+      strict: true,
+      lib: ['esnext'],
+    }),
+    afterEffectJsx(),
+  ],
+};

src/index.ts

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+import {
+  LayerBase,
+  PropertyBase,
+  Vector2D,
+  Points,
+} from 'expression-globals-typescript';
+
+// Creating layer and property mocks
+const thisLayer = Object.create(LayerBase);
+const thisProperty = Object.create(PropertyBase);
+
+// eBox types
+type Anchor = 'topLeft' | 'topRight' | 'bottomRight' | 'bottomLeft' | 'center';
+interface BoxProps {
+  size: Vector2D;
+  position: Vector2D;
+  anchor: Anchor;
+  isClosed: boolean;
+}
+
+function createBox({
+  size = [100, 100],
+  position = [0, 0],
+  anchor = 'center',
+  isClosed = true,
+}: BoxProps) {
+  const pointOrder: Anchor[] = [
+    'topLeft',
+    'topRight',
+    'bottomRight',
+    'bottomLeft',
+  ];
+
+  function positionToCenter(
+    position: Vector2D,
+    size: Vector2D,
+    anchor: Anchor
+  ): Vector2D {
+    const positionCalculations = {
+      center: (): Vector2D => position,
+      topLeft: (): Vector2D => [
+        position[0] + size[0] / 2,
+        position[1] + size[1] / 2,
+      ],
+      topRight: (): Vector2D => [
+        position[0] - size[0] / 2,
+        position[1] + size[1] / 2,
+      ],
+      bottomLeft: (): Vector2D => [
+        position[0] + size[0] / 2,
+        position[1] - size[1] / 2,
+      ],
+      bottomRight: (): Vector2D => [
+        position[0] - size[0] / 2,
+        position[1] - size[1] / 2,
+      ],
+    };
+
+    return positionCalculations[anchor]();
+  }
+
+  function sizeToPoints(size: Vector2D): Points {
+    return [
+      [-size[0] / 2, -size[1] / 2],
+      [size[0] / 2, -size[1] / 2],
+      [size[0] / 2, size[1] / 2],
+      [-size[0] / 2, size[1] / 2],
+    ];
+  }
+  function movePoints(
+    points: Points,
+    oldPosition: Vector2D,
+    newPosition: Vector2D
+  ): Points {
+    const positionDelta: Vector2D = newPosition.map(
+      (dimension, dimensionIndex): number => {
+        return dimension - oldPosition[dimensionIndex];
+      }
+    ) as Vector2D;
+
+    return points.map(
+      (point: Vector2D): Vector2D => {
+        return point.map((dimension, dimensionIndex) => {
+          return dimension + positionDelta[dimensionIndex];
+        }) as Vector2D;
+      }
+    ) as Points;
+  }
+
+  function pointsToComp(points: Points): Points {
+    return points.map(
+      (point): Vector2D => thisLayer.fromCompToSurface(point) as Vector2D
+    ) as Points;
+  }
+  function pointsToPath(points: Points, isClosed: boolean) {
+    return thisProperty.createPath(points, [], [], isClosed);
+  }
+
+  const centerPosition = positionToCenter(position, size, anchor);
+  interface OutputBox extends BoxProps {
+    centerPosition: Vector2D;
+  }
+  let boxPoints: Points = createPointsFromBoxProps({
+    size,
+    position,
+    anchor,
+    isClosed,
+    centerPosition,
+  });
+
+  function getBoxPath() {
+    return pointsToPath(boxPoints, isClosed);
+  }
+  function createPointsFromBoxProps(boxProps: OutputBox): Points {
+    const points = sizeToPoints(boxProps.size);
+    const centeredPoints = movePoints(points, [0, 0], boxProps.centerPosition);
+    const compPositionPoints = pointsToComp(centeredPoints);
+
+    return compPositionPoints;
+  }
+
+  function scalePoints(scale: Vector2D = [100, 100], anchor: Anchor): void {
+    // Remap scale to [0..1]
+    const normalizedScale: Vector2D = scale.map(
+      scale => scale / 100
+    ) as Vector2D;
+
+    // Get index of anchor point
+    const anchorPointIndex: number = pointOrder.indexOf(anchor);
+    const anchorPoint: Vector2D = boxPoints[anchorPointIndex];
+
+    // Calculate distance from anchor point
+    const pointDeltas: Points = boxPoints.map(point => {
+      return point.map((dimension, dimensionIndex): number => {
+        return dimension - anchorPoint[dimensionIndex];
+      }) as Vector2D;
+    }) as Points;
+
+    // Scale the point deltas according to input scale
+    const scaledPointDeltas: Points = pointDeltas.map(
+      (point): Vector2D => {
+        return point.map((dimension, dimensionIndex): number => {
+          return dimension * normalizedScale[dimensionIndex];
+        }) as Vector2D;
+      }
+    ) as Points;
+
+    const scaledPoints: Points = boxPoints.map(
+      (point, pointIndex): Vector2D => {
+        if (pointIndex !== anchorPointIndex) {
+          // If not the anchor point
+          // Create the point from the scaledPointDelta
+          return point.map((pointDimension, dimensionIndex): number => {
+            return (
+              anchorPoint[dimensionIndex] +
+              scaledPointDeltas[pointIndex][dimensionIndex]
+            );
+          }) as Vector2D;
+        } else {
+          // If the anchor point
+          // Return as is
+          return point;
+        }
+      }
+    ) as Points;
+
+    boxPoints = scaledPoints;
+  }
+
+  return {
+    setScale: scalePoints,
+    getPath: getBoxPath,
+  };
+}
+
+export { createBox };