The element is implicitly imparted with an 'any' type due to the incapability of utilizing an expression of type 'number' to index the type '{}'. This error occurs in the context of VUEJS

Question

The element is implicitly imparted with an 'any' type due to the incapability of utilizing an expression of type 'number' to index the type '{}'. This error occurs in the context of VUEJS

I have encountered an issue that I have been struggling to resolve despite trying numerous solutions. The problem arises while working on a project using Vue. Here is how I have structured my data:

data(){
    return{
      nodes: {},
      edges:{},
      nextNodeIndex: 0,
      nextEdgeIndex: 0,
      selectedNodes: [],
      selectedEdges: [],
      graph: ref<vNG.Instance>() 
    }
  }

Within one of the methods, I am attempting to create a function called addNode:

 addNode() {
      const nodeId = this.nextNodeIndex
      this.nodes[nodeId] = {
        name: String(nodeId),
        size: 16,
        color: "blue",
        label: true
      }

The specific line this.nodes[nodeId] results in the error message:

Element implicitly has an 'any' type because expression of type 'number' can't be used to index type '{}'.

. The proposed solutions typically suggest defining the dictionary as const dict = {key:string}. However, due to setting up nodes within the data, I cannot utilize const in this case.

typescript vue.js

Answer 1

Answer №1

To make the return type of data explicit, you can specify it like this:

data(): { nodes: ..., ... } {

}

However, this approach would require defining a lot of types that TypeScript could have inferred on its own.

An alternative solution would be to use an assertion instead:

nodes: {} as { [key: number]: { name: string; size: number; ... } },

You could also apply this assertion to the edges property:

edges: {} as { [key: number]: ... },

Considering that the keys are numbers, using an array instead of an object may be a more suitable option.

Answer 2

To make the return type of data explicit, you can specify it like this:

data(): { nodes: ..., ... } {

}

However, this approach would require defining a lot of types that TypeScript could have inferred on its own.

An alternative solution would be to use an assertion instead:

nodes: {} as { [key: number]: { name: string; size: number; ... } },

You could also apply this assertion to the edges property:

edges: {} as { [key: number]: ... },

Considering that the keys are numbers, using an array instead of an object may be a more suitable option.

Answer 3

Answer №2

To efficiently annotate both types and initial values without redundant declarations, consider implementing a minimalist data class:

class Data {
  // Note: Replace `unknown` with appropriate types
  nodes: Record<number, unknown | undefined> = {};
  edges: Record<number, unknown | undefined> = {};
  nextNodeIndex = 0;
  nextEdgeIndex = 0;
  selectedNodes: unknown[] = [];
  selectedEdges: unknown[] = [];
  graph = ref<vNG.Instance>() 
}

When defining your data method, simply return an instance of this class:

data() {
  return new Data();
}

It's important to note that while using this approach helps avoid repetition, it's best not to extend or utilize this class elsewhere. This streamlined method is useful as long as it's used appropriately.

Answer 4

To efficiently annotate both types and initial values without redundant declarations, consider implementing a minimalist data class:

class Data {
  // Note: Replace `unknown` with appropriate types
  nodes: Record<number, unknown | undefined> = {};
  edges: Record<number, unknown | undefined> = {};
  nextNodeIndex = 0;
  nextEdgeIndex = 0;
  selectedNodes: unknown[] = [];
  selectedEdges: unknown[] = [];
  graph = ref<vNG.Instance>() 
}

When defining your data method, simply return an instance of this class:

data() {
  return new Data();
}

It's important to note that while using this approach helps avoid repetition, it's best not to extend or utilize this class elsewhere. This streamlined method is useful as long as it's used appropriately.

The element is implicitly imparted with an 'any' type due to the incapability of utilizing an expression of type 'number' to index the type '{}'. This error occurs in the context of VUEJS

Answer №1

Answer №2

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