What is the best approach for associating interfaces with nested objects to ensure proper configuration validation?

Question

What is the best approach for associating interfaces with nested objects to ensure proper configuration validation?

Exploring the use of typescript for implementing type checking on a configuration file similar to the one below:

const _config = {
    local: {
        host: 'localhost',
        port: 1234
    },
    dev: {
        host: 'https://dev.myapp.com',
        port: 80
    },
    prod: {
        host: 'https://prod.myapp.com',
        port: 80
    },
}

export const config = _config[process.env.NODE_ENV || 'dev'];

I aim to define an interface for the nested objects to ensure that all configuration properties are present at compile time, rather than runtime:

interface IConfig {
    host: string;
    port: number;
}

const _config = {
    local: { // <-- I want to specify this object as type IConfig
        host: 'localhost',
        port: 1234
    },
    dev: { // <-- I want to specify this object as type IConfig
        host: 'https://dev.myapp.com',
        port: 80
    },
    prod: { // <-- I want to specify this object as type IConfig
        host: 'https://prod.myapp.com',
        port: 80
    },
}

export const config = _config[process.env.NODE_ENV || 'dev'];

Is this achievable? Are there any alternative approaches to accomplish the same objective?

javascript typescript interface

Answer 1

Answer №1

To manage the configuration efficiently, consider using an index signature in combination with an interface.

interface EnvironmentSettings {
    host: string;
    port: number;
}

interface Configuration {
    [name: string]: EnvironmentSettings;
}

const _configuration: Configuration = {
    local: {
        host: 'localhost',
        port: 1234
    },
    dev: {
        host: 'https://dev.myapp.com',
        port: 80
    },
    prod: {
        host: 'https://prod.myapp.com',
        port: 80
    },
}

export const appConfig = _configuration[process.env.NODE_ENV || 'dev'];

Answer 2

To manage the configuration efficiently, consider using an index signature in combination with an interface.

interface EnvironmentSettings {
    host: string;
    port: number;
}

interface Configuration {
    [name: string]: EnvironmentSettings;
}

const _configuration: Configuration = {
    local: {
        host: 'localhost',
        port: 1234
    },
    dev: {
        host: 'https://dev.myapp.com',
        port: 80
    },
    prod: {
        host: 'https://prod.myapp.com',
        port: 80
    },
}

export const appConfig = _configuration[process.env.NODE_ENV || 'dev'];

Answer 3

Answer №2

Have you considered using an interface to define the structure of the config object itself? This way, you can have different properties for different environments. Here's an example:

interface IConfigProperty {
  host: string
  port: number
}

interface IConfig {
  local: IConfigProperty
  dev: IConfigProperty
  prod: IConfigProperty
}

const _config: IConfig = {
    local: { 
        host: 'localhost',
        port: 1234
    },
    dev: {
        host: 'https://dev.myapp.com',
        port: 80
    },
    prod: { 
        host: 'https://prod.myapp.com',
        port: 80
    },
}

export const config = _config[process.env.NODE_ENV || 'dev'];

Answer 4

Have you considered using an interface to define the structure of the config object itself? This way, you can have different properties for different environments. Here's an example:

interface IConfigProperty {
  host: string
  port: number
}

interface IConfig {
  local: IConfigProperty
  dev: IConfigProperty
  prod: IConfigProperty
}

const _config: IConfig = {
    local: { 
        host: 'localhost',
        port: 1234
    },
    dev: {
        host: 'https://dev.myapp.com',
        port: 80
    },
    prod: { 
        host: 'https://prod.myapp.com',
        port: 80
    },
}

export const config = _config[process.env.NODE_ENV || 'dev'];

Answer 5

Answer №3

To enhance type safety, I suggest using a different approach. By utilizing type aliases, we can specify typings for the host property.

type Host = 'localhost' | 'https://dev.myapp.com' | 'https://prod.myapp.com';

interface Config {
  [name: string]: IConfig;
}

interface IConfig {
    host: Host;
    port: number;
}

const _config: Config = {
    local: { 
        host: 'localhost',
        port: 1234
    },
    dev: {
        host: 'https://dev.myapp.com',
        port: 80
    },
    prod: { 
        host: 'https://prod.myapp.com',
        port: 80
    },
};

If desired, you can also define type aliases for the names of the configurations (local, dev, prod)

Answer 6

To enhance type safety, I suggest using a different approach. By utilizing type aliases, we can specify typings for the host property.

type Host = 'localhost' | 'https://dev.myapp.com' | 'https://prod.myapp.com';

interface Config {
  [name: string]: IConfig;
}

interface IConfig {
    host: Host;
    port: number;
}

const _config: Config = {
    local: { 
        host: 'localhost',
        port: 1234
    },
    dev: {
        host: 'https://dev.myapp.com',
        port: 80
    },
    prod: { 
        host: 'https://prod.myapp.com',
        port: 80
    },
};

If desired, you can also define type aliases for the names of the configurations (local, dev, prod)

Answer 7

Answer №4

To address this issue, one potential solution is to add annotations to the parent object:

interface ISettings {
    apiHost: string;
    apiPort: number;
}

const _settings: { local: ISettings, dev: ISettings, prod: ISettings } = {
    local: {
        apiHost: 'localhost',
        apiPort: 1234
    },
    dev: {
        apiHost: 'https://dev.myapp.com',
        apiPort: 80
    },
    prod: {
        apiHost: 'https://prod.myapp.com',
        apiPort: 80
    },
}

export const settings: ISettings = _settings[process.env.NODE_ENV || 'dev'];

Answer 8

To address this issue, one potential solution is to add annotations to the parent object:

interface ISettings {
    apiHost: string;
    apiPort: number;
}

const _settings: { local: ISettings, dev: ISettings, prod: ISettings } = {
    local: {
        apiHost: 'localhost',
        apiPort: 1234
    },
    dev: {
        apiHost: 'https://dev.myapp.com',
        apiPort: 80
    },
    prod: {
        apiHost: 'https://prod.myapp.com',
        apiPort: 80
    },
}

export const settings: ISettings = _settings[process.env.NODE_ENV || 'dev'];

What is the best approach for associating interfaces with nested objects to ensure proper configuration validation?

Answer №1

Answer №2

Answer №3

Answer №4

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