Remove this from tests

README.md

Run this on your tests to remove every this.foo from the tests

npm install -g jscodeshift

jscodeshift --transform https://gist.githubusercontent.com/DanielMSchmidt/9e1bc548ab5d8d1a3fadddc2d735f8c2/raw/808d337f6088ff62feae99115edaf59a6c333b1a/transform.js ./**/__tests__/*.js

transform.js

"use strict";

function capitalizeFirstLetter(string) {
  return string.charAt(0).toUpperCase() + string.slice(1);
}

module.exports = function(file, api) {
  const j = api.jscodeshift;
  const ast = j(file.source);

  const variablesInFile = {};

  const possibleExpressionTypes = [j.MemberExpression, j.JSXMemberExpression];

  possibleExpressionTypes.forEach(expression => {
    // rename this.foo to foo
    ast
      .find(expression)
      .filter(
        p =>
          (p.value.object && p.value.object.type === "ThisExpression") ||
          (p.value.object.type === "JSXIdentifier" &&
            p.value.object.name === "this")
      )
      .replaceWith(p => {
        const property = p.value.property;
        // rename foo to thisFoo to avoid name conflicts
        property.name = "this" + capitalizeFirstLetter(property.name);

        return property;
      })
      .forEach(p => {
        variablesInFile[p.value.name] = true;
      });
  });

  if (Object.keys(variablesInFile).length > 0) {
    // Add let foo; statements before describe block
    ast
      .find(j.ExpressionStatement)
      .filter(
        p =>
          p.value.expression &&
          p.value.expression.callee &&
          p.value.expression.callee.name === "describe"
      )
      .at(0)
      .insertBefore([
        j.variableDeclaration(
          "let",
          Object.keys(variablesInFile).map(variable =>
            j.variableDeclarator(j.identifier(variable), null)
          )
        )
      ]);
  }

  return ast.toSource();
};