Emmet: Autocompletar no funciona con la tecla TAB para JSX en Sublime text 3, compilación 3143

No estoy seguro de por qué, ¡pero esto a continuación funcionó!

[
  { "keys": ["tab"], "command": "expand_abbreviation_by_tab", "context":
    [
        { "operand": "source.js", "operator": "equal", "match_all": true, "key": "selector" },
        { "match_all": true, "key": "selection_empty" },
        { "operator": "equal", "operand": false, "match_all": true, "key": "has_next_field" },
        { "operand": false, "operator": "equal", "match_all": true, "key": "auto_complete_visible" },
        { "match_all": true, "key": "is_abbreviation" }
    ]
}
]

Tenía el mismo problema, la consola enviaba advertencias como esta "el valor de nivel superior debe ser una matriz".

{
  "keys": ["tab"],
  "command": "expand_abbreviation_by_tab",

  // put comma-separated syntax selectors for which
  // you want to expandEmmet abbreviations into "operand" key
  // instead of SCOPE_SELECTOR.
  // Examples: source.js, text.html - source
  "context": [
    {
      "operand": "source.js, meta.class.js, meta.group.braces.curly.js, meta.group.braces.round.js, meta.jsx.js ",
      "operator": "equal",
      "match_all": true,
      "key": "selector"
    },

    // run only if there's no selected text
    {
      "match_all": true,
      "key": "selection_empty"
    },

    // don't work if there are active tabstops
    {
      "operator": "equal",
      "operand": false,
      "match_all": true,
      "key": "has_next_field"
    },

    // don't work if completion popup is visible and you
    // want to insert completion with Tab. If you want to
    // expand Emmet with Tab even if popup is visible --
    // remove this section
    {
      "operand": false,
      "operator": "equal",
      "match_all": true,
      "key": "auto_complete_visible"
    },
    {
      "match_all": true,
      "key": "is_abbreviation"
    }
  ]
}

El código de arriba es objeto,
y el código a continuación es una matriz de objetos

[
  { "keys": ["tab"], "command": "expand_abbreviation_by_tab", "context":
    [
        { "operand": "source.js", "operator": "equal", "match_all": true, "key": "selector" },
        { "match_all": true, "key": "selection_empty" },
        { "operator": "equal", "operand": false, "match_all": true, "key": "has_next_field" },
        { "operand": false, "operator": "equal", "match_all": true, "key": "auto_complete_visible" },
        { "match_all": true, "key": "is_abbreviation" }
    ]
}
]

Esto corrige la advertencia "el valor de nivel superior debe ser una matriz", por eso funciona.