vendor/github.com/hashicorp/terraform/configs/depends_on.go

package configs

import (
	"github.com/hashicorp/hcl2/hcl"
)

func decodeDependsOn(attr *hcl.Attribute) ([]hcl.Traversal, hcl.Diagnostics) {
	var ret []hcl.Traversal
	exprs, diags := hcl.ExprList(attr.Expr)

	for _, expr := range exprs {
		expr, shimDiags := shimTraversalInString(expr, false)
		diags = append(diags, shimDiags...)

		traversal, travDiags := hcl.AbsTraversalForExpr(expr)
		diags = append(diags, travDiags...)
		if len(traversal) != 0 {
			ret = append(ret, traversal)
		}
	}

	return ret, diags
}