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June 24, 2017 16:14
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Simple DI Container with flow
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/** | |
* @flow | |
* @fileoverview Container for getting instance. | |
*/ | |
type InstanceInfo = { | |
strict: boolean, | |
closuer: Function, | |
}; | |
type RegistedInstance = { | |
[string]: InstanceInfo, | |
}; | |
const isProduction = process.env.NODE_ENV === 'production'; | |
class Container { | |
container: RegistedInstance; | |
get<T>(modulePath: string): T { | |
const value: InstanceInfo = this.container[modulePath]; | |
if (!value) { | |
throw new Error(`Instance not found - ${modulePath}`); | |
} | |
const instance: T = value.closuer(this); | |
if (value.strict && isProduction) { | |
const Target = require(modulePath); // eslint-disable-line global-require, import/no-dynamic-require | |
if (!(instance instanceof Target)) { | |
throw new Error(`modulePath does not match instance type - ${modulePath}`); | |
} | |
} | |
return instance; | |
} | |
set(modulePath: string, closuer: Function, strict: boolean = false): Container { | |
this.container = Object.assign({}, this.container, { | |
[modulePath]: { | |
strict, | |
closuer, | |
}, | |
}); | |
return this; | |
} | |
dump() { | |
console.log(this.container); | |
} | |
} | |
// Export as singleton instance | |
export default new Container(); |
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