Devcycle/Replace Feature Flag

Last update

Jan 10, 2025

This codemod replaces DevCycle feature flags with a static value provided by the user. It replaces following SDK method calls: variable, variableValue, useVariable, useDVCVariable, useVariableValue.

The codemod accepts the following arguments:

key: The key of the feature flag to be replaced.
value: The value to replace the feature flag with.
type: The type to which the provided value should be cast.

Example

Before

const simpleCaseValue = dvcClient.variable(user, "simple-case", true).value;
const simpleCase = dvcClient.variable(user, "simple-case", true);
const isDefaulted = dvcClient.variable(user, "simple-case", true).isDefaulted;

console.log("isDefaulted: " + isDefaulted);
console.log(dvcClient.variable(user, "simple-case", true));

if (simpleCaseValue === true) {
  const someVar = dvcClient.variable(user, "some-var", "stringy");
  const templateVar = `Hello, ${someVar}`;
  const concatVar = "Goodbye, " + someVar;
}

if (simpleCase.value) {
  // Simple Case is true
  console.log("obj var .value is truthy");
}

if (simpleCaseValue === 3) {
  console.log("value var === 3");
}

const x = simpleCaseValue ? 1 : 0;

if (dvcClient.variable(user, "simple-case", true).value === true) {
  console.log("obj.value === true");
}

if (dvcClient.variable(user, "simple-case", true).value) {
  console.log("obj.value is truthy");
}

console.log(dvcClient.variable(user, SIMPLE_CASE, true).value);

console.log(useVariableValue("simple-case", true));

function hello() {
  console.log("HELLO");
  dvcClient.variable(user, "simple-case", true).onUpdate((value) => {
    heroText.innerHTML = value;
  });
}

After

console.log("isDefaulted: " + true);
console.log({
  key: "simple-case",
  value: true,
  defaultValue: true,
  isDefaulted: true,
});

const someVar = dvcClient.variable(user, "some-var", "stringy");
const templateVar = `Hello, ${someVar}`;
const concatVar = "Goodbye, " + someVar;
// Simple Case is true
console.log("obj var .value is truthy");

const x = 1;

console.log("obj.value === true");
console.log("obj.value is truthy");

console.log(dvcClient.variable(user, SIMPLE_CASE, true).value);

console.log(true);

function hello() {
  console.log("HELLO");
}

The codemod accepts the following arguments:

key: The key of the feature flag to be replaced.
value: The value to replace the feature flag with.
type: The type to which the provided value should be cast.

Example

Before

const simpleCaseValue = dvcClient.variable(user, "simple-case", true).value;
const simpleCase = dvcClient.variable(user, "simple-case", true);
const isDefaulted = dvcClient.variable(user, "simple-case", true).isDefaulted;

console.log("isDefaulted: " + isDefaulted);
console.log(dvcClient.variable(user, "simple-case", true));

if (simpleCaseValue === true) {
  const someVar = dvcClient.variable(user, "some-var", "stringy");
  const templateVar = `Hello, ${someVar}`;
  const concatVar = "Goodbye, " + someVar;
}

if (simpleCase.value) {
  // Simple Case is true
  console.log("obj var .value is truthy");
}

if (simpleCaseValue === 3) {
  console.log("value var === 3");
}

const x = simpleCaseValue ? 1 : 0;

if (dvcClient.variable(user, "simple-case", true).value === true) {
  console.log("obj.value === true");
}

if (dvcClient.variable(user, "simple-case", true).value) {
  console.log("obj.value is truthy");
}

console.log(dvcClient.variable(user, SIMPLE_CASE, true).value);

console.log(useVariableValue("simple-case", true));

function hello() {
  console.log("HELLO");
  dvcClient.variable(user, "simple-case", true).onUpdate((value) => {
    heroText.innerHTML = value;
  });
}

After

console.log("isDefaulted: " + true);
console.log({
  key: "simple-case",
  value: true,
  defaultValue: true,
  isDefaulted: true,
});

const someVar = dvcClient.variable(user, "some-var", "stringy");
const templateVar = `Hello, ${someVar}`;
const concatVar = "Goodbye, " + someVar;
// Simple Case is true
console.log("obj var .value is truthy");

const x = 1;

console.log("obj.value === true");
console.log("obj.value is truthy");

console.log(dvcClient.variable(user, SIMPLE_CASE, true).value);

console.log(true);

function hello() {
  console.log("HELLO");
}

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