https://twitter.com/therealyashsriv/status/1219691914523545601

We shouldn't generate code that might cause browser or linting to complain.

https://github.com/facebook/react/blob/0cf22a56a18790ef34c71bef14f64695c0498619/packages/legacy-events/SyntheticEvent.js#L259

It's also just a confusing pattern at best.
if (!Array.isArray(resolved.defs)) {
          return false;
        }
        const def = resolved.defs[0];
        if (def == null) {
          return false;
        }
        if (def.node == null || def.node.id == null) {
          return false;
        }
        
        
        const fnNode = def.node;
        const childScopes = componentScope.childScopes;
        let fnScope = null;
        let i;
        for (i = 0; i < childScopes.length; i++) {
          const childScope = childScopes[i];
          const childScopeBlock = childScope.block;
          if (
            
            (fnNode.type === 'FunctionDeclaration' &&
              childScopeBlock === fnNode) ||
            
            
            (fnNode.type === 'VariableDeclarator' &&
              childScopeBlock.parent === fnNode)
          ) {