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~/Developer/ML/js-ecosystem/modules/test-pythonjs (master #) $ yarn add python.js
yarn add v1.15.2
info No lockfile found.
[1/4] 🔍  Resolving packages...
[2/4] 🚚  Fetching packages...
[3/4] 🔗  Linking dependencies...
[4/4] 🔨  Building fresh packages...
error /Users/andrew/Developer/ML/js-ecosystem/modules/test-pythonjs/node_modules/python.js: Command failed.
Exit code: 1
Command: node-gyp rebuild

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Unpacking OpenEXR-2.3.0
-- The C compiler identification is GNU 7.2.1
-- The CXX compiler identification is GNU 4.8.5
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++

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Error: node_modules/apollo-client/node_modules/graphql-tag/node_modules/graphql/type/definition.js.flow:108
108:     GraphQLList<GraphQLOutputType>
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ GraphQLList. This type is incompatible with
1196: export class GraphQLNonNull<T: GraphQLNullableType> {
                                     ^^^^^^^^^^^^^^^^^^^ union: GraphQLScalarType | GraphQLObjectType | GraphQLInterfaceType | GraphQLUnionType | GraphQLEnumType | GraphQLInputObjectType | type application of class `GraphQLList`
  Member 1:
  203:   GraphQLScalarType |
         ^^^^^^^^^^^^^^^^^ GraphQLScalarType
  Error:
  108:     GraphQLList<GraphQLOutputType>

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const MyClass = new ObjCClass({
  classname: 'MyClass',
  superclass: NSButton,

  _private: 'initial',

  init() {
    log("my custom init code. no need to call super here ");
    this._private = 'test';
  },

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// Recursively create a struct
function makeStruct(def) {
  if (typeof def !== 'object') {
    return def;
  }
  const name = Object.keys(def)[0];
  const values = def[name];

  const structure = MOStruct.structureWithName_memberNames_runtime(name, Object.keys(values), null);

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// Copy-paste this into 💎Sketch.app and run it 🔥
// Scroll to bottom for usage

// Use any C function, not just ones with BridgeSupport
function CFunc(name, args, retVal) {
  // Due to particularities of the JS bridge, we can't call into MOBridgeSupport objects directly
  // But, we can ask key value coding to do the dirty work for us ;)
  function setKeys(o, d) {
    const funcDict = NSMutableDictionary.dictionary()
    funcDict.o = o

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    const colorList = {
      Haus: '#F3F4F4',
      Night: '#333',
      Sur: '#96DBE4',
      'Sur Dark': '#24828F',
      Peach: '#EFADA0',
      'Peach Dark': '#E37059',
      Pear: '#93DAAB',
      'Pear Dark': '#2E854B',
    };

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// Make a class with some handlers. 
function Class(handlers){
  var uniqueClassName = "fetchDelegate_" + NSUUID.UUID().UUIDString();
  var cls = MOClassDescription.allocateDescriptionForClassWithName_superclass_(uniqueClassName, NSObject);
  // Add each handler to the class description
  for(var selectorString in handlers) {
    var sel = NSSelectorFromString(selectorString);
    cls.addInstanceMethodWithSelector_function_(sel, handlers[selectorString]);
  }
  // Add ivar to store instance-specific info

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- (void)_setValue:(CGFloat)value forAnimatedKey:(NSString *)animationKey
{
  POPSpringAnimation *ps = [self pop_animationForKey:animationKey];
  if (!ps) {
    ps = [POPSpringAnimation animation];
    ps.property = [POPAnimatableProperty propertyWithName:animationKey initializer:^(POPMutableAnimatableProperty *prop) {
      prop.readBlock = ^(DEViewerView *view, CGFloat *vs) {
        vs[0] = [[view valueForKey:animationKey] floatValue];
      };
      prop.writeBlock = ^(DEViewerView *view, const CGFloat *vs) {