Blockly won't compile with typescript (at least v8.0.1)

[BeksOmega]

Describe the bug

If you add Blockly to a typescript project, and attempt to type check it, it will not compile.

To Reproduce

See the steps in the provided repository.

Expected behavior

Blockly's type definitions should allow a project to compile.

Stack Traces

node_modules/blockly/blocks.d.ts:14:26 - error TS2497: This module can only be referenced with ECMAScript imports/exports by turning on the 'allowSyntheticDefaultImports' flag and referencing its default export.

14 import * as Blockly from './core';
                            ~~~~~~~~

node_modules/blockly/core.d.ts:14:13 - error TS2303: Circular definition of import alias 'Blockly'.

14 import * as Blockly from 'blockly';
               ~~~~~~~

node_modules/blockly/core.d.ts:14:26 - error TS2497: This module can only be referenced with ECMAScript imports/exports by turning on the 'allowSyntheticDefaultImports' flag and referencing its default export.

14 import * as Blockly from 'blockly';
                            ~~~~~~~~~

node_modules/blockly/index.d.ts:17:26 - error TS2497: This module can only be referenced with ECMAScript imports/exports by turning on the 'allowSyntheticDefaultImports' flag and referencing its default export.

17 import * as Blockly from './core';
                            ~~~~~~~~

node_modules/blockly/javascript.d.ts:14:26 - error TS2497: This module can only be referenced with ECMAScript imports/exports by turning on the 'allowSyntheticDefaultImports' flag and referencing its default export.

14 import * as Blockly from './core';
                            ~~~~~~~~


Found 5 errors in 4 files.

Errors  Files
     1  node_modules/blockly/blocks.d.ts:14
     2  node_modules/blockly/core.d.ts:14
     1  node_modules/blockly/index.d.ts:17
     1  node_modules/blockly/javascript.d.ts:14

Additional context

Reported by a lovely forum person here.

Changed somewhere between v6 and v8.0.1

[maribethb]

Duplicate of #6079, please follow there for updates