Category: TypeScript

Sometimes, we want to add environment variable with dotenv and TypeScript.

In this article, we’ll look at how to add environment variable with dotenv and TypeScript.

How to add environment variable with dotenv and TypeScript?

To add environment variable with dotenv and TypeScript, we import the dotenv module.

And then we call dotenv.config to load the enviroment variables values from the path specified to load them into process.env.

For instance, we write

import * as dotenv from "dotenv";
dotenv.config({ path: __dirname + "/.env" });

to load the environment variables from __dirname + "/.env" with dotenv.config.

And then the environment variables should be available as properties in process.env.

Conclusion

To add environment variable with dotenv and TypeScript, we import the dotenv module.

And then we call dotenv.config to load the enviroment variables values from the path specified to load them into process.env.

Sometimes, we want to generate UUID in Angular.

In this article, we’ll look at how to generate UUID in Angular.

How to generate UUID in Angular?

To generate UUID in Angular, we can use the uuid module.

To install it, we run

npm i uuid

Then we use it by writing

import * as uuid from "uuid";

const myId = uuid.v4();

to import it and then call the v4 function in the uuid module.

Conclusion

To generate UUID in Angular, we can use the uuid module.

Sometimes, we want to replace all instances of character in string in TypeScript.

In this article, we’ll look at how to replace all instances of character in string in TypeScript.

How to replace all instances of character in a string in TypeScript?

To replace all instances of character in string in TypeScript, we can use the string replace method.

For instance, we write

const email = "my.email@email.com";

const re = /\./gi;
const result = email.replace(re, "x");

console.log(result);

to define the re regex with the g flag, which matches all instances of the pattern against the string we call replace with.

Then we call email.replace to match all periods with replace them with 'x'.

Conclusion

To replace all instances of character in string in TypeScript, we can use the string replace method.

Sometimes, we want to fix the "parameter implicitly has an ‘any’ type" error in TypeScript.

In this article, we’ll look at how to fix the "parameter implicitly has an ‘any’ type" error in TypeScript.

How to fix the "parameter implicitly has an ‘any’ type" error in TypeScript?

To fix the "parameter implicitly has an ‘any’ type" error in TypeScript, we can set the noImplicitAny option to false in tsconfig.json.

For instance, we write

{
  "noImplicitAny": false
}

to set the noImplicitAny option to false in tsconfig.json.

Now the "parameter implicitly has an ‘any’ type" error shouldn’t be showing for untyped variables.

Conclusion

To fix the "parameter implicitly has an ‘any’ type" error in TypeScript, we can set the noImplicitAny option to false in tsconfig.json.

Sometimes, we want to add switch statement for a specific type in TypeScript.

In this article, we’ll look at how to add switch statement for a specific type in TypeScript.

How to add switch statement for a specific type in TypeScript?

To add switch statement for a specific type in TypeScript, we can add them as we do with JavaScript.

For instance, we write

interface Action {}

class SpecificAction implements Action {
  kind: "specific";
  payload?: any;
}

class ToggleAction implements Action {
  kind: "toggle";
  toggle: boolean;
}

let action: SpecificAction | ToggleAction;
switch (action.kind) {
  case "specific":
    console.log(action.payload);
    break;
  case "toggle":
    console.log(action.toggle);
    break;
}

to create the action variable that has the SpecificAction | ToggleAction.

So the kind, payload, and toggle values are all valid properties.

We compare the action.kind value with the values listed with case.

Conclusion

To add switch statement for a specific type in TypeScript, we can add them as we do with JavaScript.