Review contents of `blockly.js`

[rachel-fenichel]

blockly.js is full of public stuff that doesn't really fit on any namespace. This is a problem because internal code requiring it causes circular dependencies.

The fix is to move everything in blockly.js out into separate files and require those from inside the codebase, while leaving aliases behind in blockly.js for anything that should stay publicly accessible.

In some cases, we also need setters so that external code can change those values.

In other cases, properties should just not be exported.

This issue is for tracking decisions about these properties and whether those decisions have been implemented.

Needs decision:

• hideChaff
• alert
• confirm
• prompt
• hueToHex

Can be internal:

• Blockly.jsonInitFactory_
• clipboardXml_ -> clipboard.js in Move clipboard functions to a separate namespace #5237
• clipboardSource_ -> clipboard.js in Move clipboard functions to a separate namespace #5237
• clipboardTypeCounts_ -> clipboard.js in Move clipboard functions to a separate namespace #5237
• parentContainer -> common.js in More cleanup of blockly.js #5262
• draggingConnections -> common.js in More cleanup of blockly.js #5262
• onKeyDown -> inject.js in refactor: Migrate Blockly.onKeyDown out of blockly.js #5476

Exported function, but moved to a different file and aliased.

• bindEvent_ -> Blockly.browserEvents.bind in Move bind/unbind events functions to new file, with example usage. #4642 (2021Q1)
• getMainWorkspace -> Blockly.common.getMainWorkspace in Move main workspace to a new file, common.js #5244
• copy -> Blockly.clipboard.copy in Move clipboard functions to a separate namespace #5237, and tracking remaining work in Keyboard nav uses non-public properties in paste blockly-samples#833
• paste -> Blockly.clipboard.paste` in Move clipboard functions to a separate namespace #5237, and tracking remaining work in Keyboard nav uses non-public properties in paste blockly-samples#833
• duplicate -> Blockly.clipboard.duplicate in Move clipboard functions to a separate namespace #5237, and tracking remaining work in Keyboard nav uses non-public properties in paste blockly-samples#833
• setParentContainer -> Blockly.common.setParentContainer in More cleanup of blockly.js #5262
• hueToHex -> Blockly.utils.colour.hueToHex in Migrate Blockly.hueToHex to Blockly.utils.colour.hueToHex #5462
• alert -> Blockly.dialog.alert in Move alert/confirm/prompt to a new file, dialog.js #5457
• confirm -> Blockly.dialog.confirm in Move alert/confirm/prompt to a new file, dialog.js #5457
• prompt -> Blockly.dialog.prompt in Move alert/confirm/prompt to a new file, dialog.js #5457
• deleteBlock -> Blockly.BlockSvg.checkAndDelete in refactor: move Blockly.deleteBlock out of blockly.js #5483
• svgResize -> Blockly.common.svgResize in refactor: Move Blockly.svgResize to Blockly.common #5485

Exported function, used only externally and therefore left in blockly.js:

• isNumber: Used in generators
• defineBlocksWithJsonArray: Used in block definitions
• svgSize: Deprecated already, and marked for removal in March 2022
• resizeSvgContents

Exported read-only property:

• [ ]

Exported settable property:

• mainWorkspace in Move main workspace to a new file, common.js #5244, with a follow-up to add deprecation warnings.

Can be removed:

• checkBlockColourConstants: Only used internally, and as a deprecation helper for an old deprecation. Deleted in More cleanup of blockly.js #5262.
• checkBlockColourConstant_: Only used by `checkBlockColourConstants. Deleted in More cleanup of blockly.js #5262.
• cache3dSupported_: Not used. Deleted in More cleanup of blockly.js #5262.
• onContextMenu_: Not used. Deleted in refactor: remove unused Blockly.onContextMenu_ #5480.

[rachel-fenichel]

@cpcallen This is obviously incomplete, but is a place to start in on pulling apart blockly.js. I think this is going to take multiple passes. For each thing we need to decide what category it belongs in and where to move it to, possibly including creating new files.

[rachel-fenichel]

Breaking out parts of the remaining work:

• Move alert, confirm, and prompt to a new file
  • Move functions
  • Update all internal uses
  • Add getters and setters in blockly.js for backwards compatibility
  • Record rename in renames file
• Move hideChaff to a new file
  • Move function and resolve any circular dependencies
  • Update all internal references
  • Record rename in renames file